Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38be873d008e22f…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 14b405fd0f8dca30e3838f70cc9211a3 SHA-1: 13350096e3f46c72bd5f612565691b7781349e44 SHA-256: a38be873d008e22f6a54807a9c6bd7885ea9d9b5297fc412add628a4bf4e3b4d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'LOLBin token sequence in document text' further supports the malicious nature by indicating attempts to disguise malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sequoia59.com/clients/867919/File/46767005833.pdf In PDF document text
    • https://clifestyle.net/uploades/userfiles/file/buxowe.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jfoaqq8arkh9pdfb9fg2kqahsv/sironokodu.pdfIn PDF document text
    • https://kristinanamaste.eu/files/54068054685.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/69505532523.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/gosewavojutip.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b824496631---72398394180.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0823fc9d---18432281612.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4c6gb2du4hbcl3a8kfbqlerna/xififaxufevukagiv.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a8aa98ac83177a78eed2b165e2405ddd/20451885779.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/muxababopiderovusodi.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/kowisutox.pdfIn PDF document text
    • https://digireg.nu/upload/56245158655.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5cb1cba3---11178356918.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3f410f953df7fb73db65eda11a71572c/wemonamavovugexod.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/tixani.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/70346661830.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdbaa588f---87736513052.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8efc3b4fd07fce0c15f483e2719860e/38472136720.pdfIn PDF document text
    • http://mesterek.net/tmp/loruzilabux.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b3899d49b4439b890f8acc4cd48e7977/13944613052.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sm7pe0g6j7kiv0dfhbcmddglcr/25312783966.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/busobubowikomija.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gonolinige.pdfIn macro / runtime command snippet
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ec850244---39631802999.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd40a91cc3---86852156704.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=shoe+flower+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 17340 bytes
SHA-256: 898db04cb2f29e1430a3ac40478dad484711ff067ec6eaacf455a7dd3069cfca
font_01_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 10556 bytes
SHA-256: a2c55471a86960f5ae0a280a8be2370ff84fe5c85d5a67784aab2a523250d49a
font_02_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A9 2092 bytes
SHA-256: 4e726621618450a1a8e6e95146ab7445e71366e16ea1aaf62970fdc8c5189e04

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