Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa371cbd40d0a7ac…

MALICIOUS

PDF

109.8 KB Created: 2021-10-08 23:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9f3b41ae5812849ff3455c51745fd91 SHA-1: 76bfd3ce8dc2bd1f18be583383be5a1978271784 SHA-256: fa371cbd40d0a7ac195a9fe0c26e362f8ee1d04a74afd451fb0a673b0d48fbcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised WordPress sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pistant.ru/uplcv?utm_term=ayoade+on+ayoade+review PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/515ccedb3e3688cbe259fc71cf0d0a23/ruwoseg.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/movemodogebu.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/malojoxesujutitovuluwop.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/nogag.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6318f92e---10285418739.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/bemagozod.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/zukirizon.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/kolixesimubanolutajegelu.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/12943872889.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/vujesesulaza.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/56373882518.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fqr1cr27sqnl3ek5rgmhh7s26s/tofatifumenovet.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/30606113184.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/95246156407.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/logoza.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/61837000267.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/99995192361.pdfIn PDF document text
    • https://fasaac.org/temp/files/21406660748.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/84bf2e658348342726522d8121cfde49/fepakemofol.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/16909683644.pdfIn PDF document text
    • https://hgb.se/filer/file/zogeba.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/70727606243.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/sapetago.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/54598089542.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/movanovapidusovafoduno.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_off00014353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14353 10176 bytes
SHA-256: 236df50aa4e0f56f859b5d33019a7ed674be428afd63cd7e7e7ffc8ba70d824f
font_01_sfnt_off00015a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001725a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1725A 20844 bytes
SHA-256: 6dc528860f2e2012d552901bfc9b56112ffabd806c7508c32fb672a9114969ba