Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c13eb2303f68e3…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 14:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 75e2ea3e8e4ae0be7cfb878576b74cfd SHA-1: 5c0799feee3524ff9f9c2c4e61b18ee0c05c8ca7 SHA-256: f8c13eb2303f68e39b054823ca4deb2789a6bbe01f971eefc5b33f84e216fc55
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cea87671f0becb168ea349969ebb6359/57407128001.pdf In PDF document text
    • https://xistenze.com/files/files/61531045459.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/22086975748.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/noxewuw.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/717dc737e90eda08b7a2668656832c47/72515402534.pdfIn PDF document text
    • http://getem.plfiles/file/85431516396.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/484bdd3dbf1bf17877b28334ffbe41e7/modaluvegejesapesolavuka.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6eaac716d8176e4be682b52c795bd8c0/lopusageriki.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/885a4f702bc934a54013cecb6eba817d/nomevobupibotifezarutamu.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/mezisuzijaxeliwoj.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/kadav.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/84810qr75qmv86kb2af2ubg5gq/sagelulomepijufubizi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f9a931097---57244419817.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/veliguravamuzevuwusek.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160828113ec323---sirazatiluz.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c019c512---774705434.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/71984377926.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c771205a70---1006605586.pdfIn PDF document text
    • https://inncredel.com/uploads/58779674257.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210629_173C93E408314A53.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ac4f228d---wogazo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gefaeb5k9nbt3s8nfciep7r0u3/33328366076.pdfIn PDF document text
    • http://wami.cc/data/files/lixoxojajemuvadunokawekan.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/simapunitotufisu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac34936781---99134865082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+lion+man+and+the+geek+girl+read+online+freePDF 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_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 17288 bytes
SHA-256: 4d49f0846b5ec6c4159db33225029e69ecba38d14e60bade84010eeb5e49dee1
font_01_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F6 10688 bytes
SHA-256: b413f9222e9d58b5215d6e403ec8dfbba2a4fec4f5f2f428264593ac449db2cb