Malicious PDF — malware analysis report

Static analysis result for SHA-256 682083cd6366b9e6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 20:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9bee6416c3412becf0b51e51dd1b1e08 SHA-1: 776adccc85f3b89996a64a08b4bac0225994fe36 SHA-256: 682083cd6366b9e641c0a8f3317c8dfebedbe89460c2c43eaba1fe2b30d01494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://rolmech-strzelno.pl/Upload/file/91330369813.pdf In PDF document text
    • http://studiodabo.eu/userfiles/files/domegabufadulavukoxup.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a397b2ba1f---89465977991.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/23803446257.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/taxalagakigopibomenaxoxu.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mopazinunaxa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe8245db0---27528067393.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/79f5b9f0508379c538394a80a92e22d8/povofumolubaraloven.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/dadofegeporaf.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/rekazixem.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/zabavujoxolubatemune.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afbccc82feb---39552312416.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/pebovudiwi.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/sovoj.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/35382930885.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/air4b399o95rk9hgc8nnmr91c1/fetagezofanumajosadelobe.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/6783307780.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/73ffc6qb8ueposm9e1l83bce65/zumudereboxubak.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e5ab855677977c14f96628c166d1c43/vojinuzofosik.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b402e2bc614---52079384199.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/mikuluwiluragezo.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/jatagatedux.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/denusopofego.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d70ce9f3---56802769815.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/67bc16a7e72fc94ebba2aa10c5639605/wavidagawinaloriwufetes.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/29465729449.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/53641185878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nalayira+divya+prabandham+pdfPDF 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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 17524 bytes
SHA-256: 166a9f783a258524f2f939abf4c17de6f735bc5fe6deb258b20ba62057cd87e9
font_01_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 10544 bytes
SHA-256: 8135dfecb2e071d41a4d500720eac75c8037782cb4ebbe36d612ef812b278dba
font_02_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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