Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aa10d81c0751b1…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 07:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20c32c8790ed34df559b656c133efc0a SHA-1: a84b165adbb94778c857bb49c9361b34f7c1ad49 SHA-256: e5aa10d81c0751b1ebe8bc44c23c69b32b0c61503d86471f9b2d306046583f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this phishing or malware distribution vector. No scripts were extracted, but the overall structure points to a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=metals+density+chart+pdf PDF link annotation
    • https://portofcrotone.com/dati/upload/file/31265165832.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160748c0c69668---nemiwikululub.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee48bdc305c---66526973201.pdfIn PDF document text
    • http://teplospectr.ru/images/files/jotaronazi.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/64586610765.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mlc9p06kc1khli05i0elvt51km/zajozaxamimobezuxilaxuwu.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/64231421817.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/lokakir.pdfIn PDF document text
    • https://netlandschool.cl/files/rajuboxumemewavan.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c2ba001dc59cfa3ca9be5021c3aadcef/dapitovadalisiwedo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607004635e439---18368594752.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/27240768385.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1377f908---63778686828.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/36553378900.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/95581995160.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ed168353752dd8eee936686c29b3b836/61918421813.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/jezapotatepadu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd72a1451b---68778472777.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a341d4963c---87441764142.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/22212109046.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae1a4eca7---fapil.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/42877740881.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_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 20756 bytes
SHA-256: f88f0f293490d856db2b3c3152e81bc218ceab508d914397bbb31e985df2a177
font_01_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 10704 bytes
SHA-256: b05b983aebd1d84a77501b0ecf04007741d20bb973f89232ed1f9eb208b900b4
font_02_sfnt_off00014005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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