Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78bbc72e41ffc31…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 06:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b167dbb69ac8fd2282705da447042cb3 SHA-1: 328f257f5198f182baf2f564811881f230b62f2a SHA-256: a78bbc72e41ffc31c3f7ef28aacfd7a8c888a4213e2ce9234ff1ef89d03f53bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56d5b2f485f464d1c85fdd3a4377c780/puroresexifamakix.pdf In PDF document text
    • https://bloc-immo.com/images/75576182193.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f024ca8826d---namubixaveki.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090908f0c7d0---vovoput.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/25285828989.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3bbr6051u4ti5s78v0rc7a0qa4/wulujefawinofiwufepej.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160771d61524ef---megakusenemuvowe.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea21956772---bepudijixa.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/musajoxesalazelozomutizo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kimara.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gukoson.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/59940734269.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/15428248612.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/zisokolagamajojuzenegoxeb.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/zagudi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f5697a74dc3d069f5086ba6f7551cc51/koximetilimefawenoguki.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079481162ded---foxezomemalugagomewejixap.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/mibaleduwafixi.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/c5d9b5359ca05d46e86219efc46b4673/29072089356.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/tubuzefakoxofeb.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/82999162631.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/welepusopev.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e63938cdc1---68365556915.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/smupis7odt2rl3neq6fk1qnbgv/nekosemikolap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=maari+tamil+full+movie+watch+online+tamilrockersPDF 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_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 17160 bytes
SHA-256: a7321800dd85c94badf07cab4279bf864c5c2c2af9a344c55940838d5c983fda
font_01_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 10940 bytes
SHA-256: 59938b93d4cb2d6755f1305ad352e196eeeb5b07d5b35d1d10df5220f6e5fff3
font_02_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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