Malicious PDF — malware analysis report

Static analysis result for SHA-256 818ad93c7ba17f3e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 10:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77d4e3a1a71417c71ad034adce754630 SHA-1: 0d259a6c53ff02ddd1a520b5b78adddc0dfe8415 SHA-256: 818ad93c7ba17f3e775fcfe09e726896082bb701e2aa296500a3a7515d920e93
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document attempts to trick users into calling a phone number, a common tactic in callback phishing scams. While no scripts were explicitly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a phishing infrastructure designed to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=planches+de+rorschach+pdf PDF link annotation
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/xivanunobigas.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47a6c8c1b---vixaruxakun.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/magexeguzetawigosuxizema.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980ba40d4f---1351973076.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fc725d59f340d12b5b3e1b38df96942b/xoworuruwesosupelumu.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/rejoloxemelukalut.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/siwozela.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/27460188776.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/lilalumivajutupiw.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/xejixegigolesi.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/34937469495.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/nuxuroledoxip.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608261f4e62e7---vemejiderat.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/10985792455.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/96788285512.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f82ca5db---lisenazipejuminuma.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/woboferemom.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/minumirinabajogukatabago.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/21bb8576c7174466239e0780a523bad4/tigam.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094287e47407---wajatav.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/31483504718.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2c0594339f3aaacae72076583d242098/lemikurugulaxejevi.pdfIn PDF document text
    • https://buka.ru/sadm_files/xisaxomote.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a21e9c1d81e0fb63d34f1e1117affe68/dudavamepuwevad.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/sopizokatijagowuva.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/rurobeparilito.pdfIn PDF document text
    • 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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 19088 bytes
SHA-256: 2bf73a71f306a6bcabdc0ec851bda5caa7a8e69240ea54e95bda571382f25c0e
font_01_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 10528 bytes
SHA-256: 2aa1c57e0d501e2f4137e5f2121bbc7e95706f85c2cf7a2302f662994b7d80ca

Open this report in the interactive analyzer, or submit your own file for analysis.