Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5de08153d39f2d…

MALICIOUS

PDF

153.9 KB Created: 2021-09-07 01:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0196d157bf77bcc036c31bab49b4baa SHA-1: 307b18125169d6582a0efe845fdd230cd840278f SHA-256: 3a5de08153d39f2ddb1bf2a4bbd1b2ea7ac6f12e737dd1a33add614224a471c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised CMS uploads or disposable hosting. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 http://americanpetrochemicals.com/customers/CMS-IMAGES/file/68666029795.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b098af03a54---wumidukejurop.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/dinaliwi.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/43864706097.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/28649152603.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jejasojamab.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/39356150682.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/6729519547.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sepat.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/liketudukojotezupifonod.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/besibute.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/kejifutelegakazur.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/85717485755.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/58017679840.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610406fc4c390---sovobimikeniwatuti.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/6969372867.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/47916410262.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/79712320362.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/moxojekojufinepiwozotef.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160790f7635d8c---76342715960.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18f9e32477---sijuzodizalosokori.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/32225638154.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608686db0fa3b---1670458291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=revista+boticario+ciclo+8+2019+em+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_off0001e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9C0 11596 bytes
SHA-256: 36286168271026ee541ec2f16009e292de1aa8d3344e43e3deba2122a364a46f
font_01_sfnt_off00020538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D4A 23160 bytes
SHA-256: 56ce7dad3d5d4a6101b19f575a8c5c73861ffb4ba8f0a3e2bd8da387c9e5d53b

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