Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79811062e301a1b…

MALICIOUS

PDF

80.4 KB Created: 2021-08-23 22:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b216e27531a80213368882df568f25e1 SHA-1: cc722b8e07a94975dd5ad39a7d4e26dde315c844 SHA-256: c79811062e301a1b7563b5a1da02abb9873ae57cc053031a663d4c5942ef0544
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/04q1jbcsroharrkuaknof8h2l3/53598960070.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/554da0a22d9994b552a803afb701d839/ralorixazotajoledoke.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610646591f2fa---labubobaboripomas.pdf
    • https://laurallo.com/ckfinder/userfiles/files/27928332253.pdf
    • https://pet-fashion.ro/mm/file/tusilakexamufedugetuj.pdf
    • http://gelikonline.ru/content/Files/57005341756.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94aac0904---ravisolib.pdf
    • https://pasarantogelsatu.com/contents//files/99125214261.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093bc6f4060b---71778123850.pdf
    • https://footballsod.com/images/ck-uploads/files/99611843486.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/950f99d4beddc15ce99ce07552988142/wuwobevizirujinon.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/81202a9f83fb8f1dbc2755aad5ec9a76/52669904446.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1l88hjovbjomneajt7fma2ain2/91480145048.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedae158fb---2705137362.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f46a35714---62296103784.pdf
    • http://uniroll.pl/user_images/file/wosamezezodowekotonu.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d62d71ef8b1---81346104506.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/54074345702.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e4322927---34292414244.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6146d4cdc---5828038296.pdf
    • http://aaaexpressheating.com/userfiles/file/pigipijuwa.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/629a6992a629ddf64d31c5637d161b5d/1943525801.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b9390085e14864d07b09b8f95cd94030/75842965600.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+11+dark+mode
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16792 bytes
font_01_sfnt_off0000ecb2.bin
c2802488163761b6465e024d178123d9a443007f5498351e06948d21d41b7342
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 10220 bytes
font_02_sfnt_off00010399.bin
7ee05416f7ca56fc833463d320827942828ea490e76f6a681071c3717b52a42b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 17544 bytes