Malicious PDF — malware analysis report

Static analysis result for SHA-256 771bae2a63fdb558…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 19:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4325827c068e50acc2d06d41249519b4 SHA-1: 1f91cf15ddf5df98d55f4641b78cc9ac8879eb90 SHA-256: 771bae2a63fdb55883c726d715b2f8fa75d2cd7f37b07d747f02339aca6db12e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'LOLBin token sequence in document text' indicates potential exploitation or obfuscation techniques within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbc998469---lajozexukaruvukaketa.pdf In PDF document text
    • http://storemisr.com/uploads/files/xemuporudaloraw.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903132337.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/22316459103.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/1292521131.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/modupaxafamakilufem.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132edd945454---giretixuxiropukowokaveva.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/360d9226ec0d928c6d68a12afbe9afb6/xipagenokigejudere.pdfIn PDF document text
    • http://pasaru.com/upload/files/35046305102.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/97404084950.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/kaxodim.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5dd2f2b6---97916435189.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/dbd0230f48177fb31bc1f82ef231e098/12331707872.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/15518475966.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/91552953085.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161345d76e1801---maxazadifanomu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136511fc51f5---zatinoziruwerijeduwuvufaj.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/daxatuzupovapoxemafev.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/mebanibugatowoludu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/16739581476.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/3268861960.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109010108501838.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jewite.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/nutesarezopemomi.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/nazajafanugamupatajakoked.pdfIn macro / runtime command snippet
    • http://trieuduong.com/images/Download/fenewapog.pdfIn macro / runtime command snippet
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1r340l35dbvjsccugqobhr8mu1/52355150547.pdfIn PDF document text
    • http://officinedesign.it/useIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=three+point+lighting+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 18204 bytes
SHA-256: c9cbc635b16690e388b676ab1fdaebcd1f83c92e62527b9923138343b64457a9
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 10408 bytes
SHA-256: a5a6b4f144dcee4de6b48d884e6c4627aa033018b15de46d29ba8eab1d54d725
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1