Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e145fe34053741…

MALICIOUS

PDF

86.7 KB Created: 2021-10-09 21:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 27adc83108bd3621f99c2c61ea961670 SHA-1: e4c205c7ee8fe9db0313ebac758a88963b4da5e5 SHA-256: e0e145fe34053741161246f2efe75d2ec93cf94b16b415834d6349f698108f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://medpressa.ru/files/file/pulomewitoxavidojifep.pdf In PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiwugerapafubez.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/dusixejosixoleje.pdfIn PDF document text
    • http://bamila.vn/luutru/files/70305251156.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gigunabetedidarukem.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/21408054464.pdfIn PDF document text
    • http://nscenter.cn/upload/files/kuzatobe.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/gotewako.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/takiruvilepojum.pdfIn PDF document text
    • http://laduses.nl/image/file/16011261738.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/54b5eebf9e46bca08f26f21ff3f9937c/sagukixunenaberevalimog.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/legipumofaxoxafa.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/99768794225.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/wowosaxozeduful.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/rakunabav.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/86098082313.pdfIn PDF document text
    • http://theponghop.com/upload/files/39498390627.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/befusodutakojaninixino.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3a498721d---buzoziru.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b8da520694f05a40bbf5d352a07b8f19/kaveribi.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/49997891762.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210923001913611341ucxbp1jc6iph.pdfIn PDF document text
    • http://videocycling.info/files/file/26004318695.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/38204647774.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/botuuldm7d5c3b6opvd5fdto26/kefinavuvopenaveninos.pdfIn PDF document text
    • http://sarafis.pl/img/userfiles/file/vizunej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+beat+impoppablePDF 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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 19536 bytes
SHA-256: dc0c13b6604daae5e60b1d52eba614b7ed719a63aa9179f62fcf1e85594e4f67
font_02_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 10256 bytes
SHA-256: 199b6a16849cc45b8cf2131b78f3d8423b7973bc1fd0815f21d2c473f4d7053c

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