Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7b533efde52c42…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 20:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e24076b51951c1516dc7bdd10c5d1f4c SHA-1: cc0950ae93328c180b5c9b976aea85d1e2a4d05f SHA-256: 0e7b533efde52c425188dc08bc3dbb61d837dcbb00b5d6509209a276faae6d5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains, likely as part of a phishing or malware distribution scheme. The embedded URLs and link farm structure indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/70e10f6bd9caa2b30188a8f7f5f6ed38/8948163265.pdf In PDF document text
    • https://chung-pei.com/userfiles/file/24544624612.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210617011310189.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/10038209000.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610c075eb8176---liguk.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160734e71ee6d8---gifukewaf.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u3c6v4ioihnp1otjtjq8qe2eht/21115871839.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b376734e480---75339894468.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/xowiferupuvenezovodekixok.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/510cbc254368b83f8c154a4cd7a163b8/nedolu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b83228e6---pogukexifisufadiv.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/mijebivinefifumetibuwuzek.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/vboisvqllbnacgm2evshqvrqel/daduwidupuzo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3mfr68mjuq8m5c4256i1630cqq/zumazibuguwopoxiduxisuvad.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/69522920907.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f01e0bab286---95194685147.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/derefav.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/lajuxebajag.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b05383fff---11920938307.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/muzanuriterav.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/revafupawukimuvitigoxaxe.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/modelodirotivajukixuve.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/luzakoxiwuziwidisalaxonuz.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbaa70e9d8---fuzovafabadojubudodozeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mp+patwari+syllabus+2019+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000148c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148C8 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 11256 bytes
SHA-256: a14e9c78dded0c5a471a8f4c43d970231d532ea6f3bac2c2393fb9c6a8cfaf66
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 21568 bytes
SHA-256: 60f4cf65323197c123a69d944fd8208c33299d8591b9dec3accc18211c1376a9

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