Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec68fb1cd644d653…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 11:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 395a8c000de0ff40b5556341dc5cbc27 SHA-1: 10de67c24b8bed5c7e4faf6e007924572424c5c0 SHA-256: ec68fb1cd644d653b0b642e045e1c073e2a27c10cce675cb3985778e86229d8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, likely exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/71f23a8142d905c18783616385f03131/mepiretunexoxagawizaxejaz.pdf In PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/kalofibinukudasewitexuton.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fe0fe82bbf5877f9acde1aaa4f2e0787/sorifafomitimunilatemarum.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/melagovorukavekigagok.pdfIn PDF document text
    • http://elskenecologie.nl/files/9931460430.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1655c5914657df51d9b7a726ed5ada3d/95815313491.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bcb56de55a3dcda8a1c4929506159461/60542270825.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210911140522529.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/2668657419.pdfIn PDF document text
    • http://newo.ru/files/files/83327897655.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909235828.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/90990728544.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/42869199728.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/doguje.pdfIn PDF document text
    • http://gr-chem.com/upload/files/11121432739.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab933a4c85---73368979802.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/zukizufanoperazarotug.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c07eb5b44407f4f084a9ca947c92e35a/37160878487.pdfIn PDF document text
    • http://vladekoservis.ru/files/44542236514.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409cd7dec3d---memukebedoviniravovafeti.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133178226757---zukojepavalotojarafulor.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/paxowifolavese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rig+veda+samhita+in+sanskrit+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_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 10984 bytes
SHA-256: 5d90d435fa7f0650972604e98405c7fc97b06144b1080734d64ab82a52cab142
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16804 bytes
SHA-256: 7599073303b3a00fac1fcca72dc4dc50a01d9d5c77c7b211da41ed75bb968c4c
font_02_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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