Malicious PDF — malware analysis report

Static analysis result for SHA-256 50881b998fbd0a9d…

MALICIOUS

PDF

93.1 KB Created: 2021-07-27 11:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b6eadd9fbf572e22fc105f8a1dc3e7e SHA-1: f29fdddc940bb51b92d2d77a3d08e6062222f324 SHA-256: 50881b998fbd0a9de5cc201c7ef4f65d5cde701971313d7abf41b0e3facdd8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution lure.

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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/589fc8af45bfeb68ac7bb4d7c7ee03a0/vidide.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/69598898367.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/75892610638.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/935b2a5d03ddb2837bd0fd9b359eeef6/vezixesuduwafabuvidajufe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cmfn5db9m2sa9qea8encodu10/3911807084.pdfIn PDF document text
    • https://sfilatinogourmet.it/file/20062200896.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/15391625655.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/5355076341.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/fabozojim.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d24aaf2047a03c170c98a5b19980b427/fazujogewiz.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9c6d57238d006dffde32f0058870b5b3/makef.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9tpivlfkcbf9qpvld8e3medrtq/menawikamirilaboderumip.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/xuwakojo.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/is24kdpcn0hk1m4kd955aen2ek/romaxiki.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/48042797296.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/kafelufoxarokigizuwiki.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/godixisutuvumexuronaro.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/42971162978.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/24110350703.pdfIn PDF document text
    • https://stopserv.ru/files/file/81301784219.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c08dd32cac1a51426f0d964e9850eac6/borowazip.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89cfd1583---66929275886.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/31272839925.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zopamazegakanebumun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+de+sin%C3%B3nimos+y+ant%C3%B3nimos+en+ingl%C3%A9s+para+ni%C3%B1osPDF 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
font_00_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 18596 bytes
SHA-256: 1fcda922d3ba4a8caa28b62327d0090071a13e09052f9b3f88f54d56b751abcd
font_01_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off00012f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 11584 bytes
SHA-256: c65c5eba1e2a4dad165360f9cd9165d05a4d80d2995277c32fe04bed73ea5a97
font_03_sfnt_off00014a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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