Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b73fc5e6cf55d5…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 17:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e7da2df04bfeb2d7c008a4be2309951c SHA-1: 6bf806a2606462e5d62d1a3feddae4225b5ab117 SHA-256: 38b73fc5e6cf55d598a3c5e33b7d3f577bb85e5a3a58a19b31d563691b958760
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://pixomot.ru/uplcv?utm_term=asvab+mechanical+comprehension+study+guide PDF link annotation
    • http://cortabellanews.com/userimages/fekagigikokuxasudexujafi.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/rosapiveriwowobaxige.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/2952199017.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0d1398b2---21635916867.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/42543607346.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/12086093236.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0bca2c417ec2402377398ff3f29d21b8/mekaperevuzinijapuw.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/54709813878.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/78717213254.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/28403564267.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d961731e67c---wiripizasatefewawuxu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2f0af9df---rilexejodosezewut.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/veloto.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/tevif.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/77224796972.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a931fb9098d---45703706927.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafaxevuvokenupide.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/34048863564.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161052f7c32005---rinevogefu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/dozumewebusarasamifopu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/vojeza.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/65745830111.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/33308209863.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/vorurine.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/nelateterekofu.pdfIn PDF document text
    • 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_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 11364 bytes
SHA-256: 3e13cb3026a38655fb5e82f6cbc403f0c181e6a6cfd4fa5b0627d5d660e6dc50
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 16648 bytes
SHA-256: d22146309257739b0890ac612eeca721bb043daf0c6a9ef9a05cddf471bf70f4

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