Malicious PDF — malware analysis report

Static analysis result for SHA-256 999dc0f7026f4270…

MALICIOUS

PDF

102.1 KB Created: 2021-09-07 13:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ced5ce5e5e2bdfe55feada7ae57fcbc SHA-1: 70191032fe00bdbc7c23bb2f04df64cef7e811b4 SHA-256: 999dc0f7026f42700bbe65c186a61d345329da5772a94162cbf3b252ca2d9df9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts users to make a phone call for fraudulent purposes, aligning with callback phishing tactics. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://oniceh.ru/uplcv?utm_term=ietf+rfc+3588+pdf PDF link annotation
    • https://sklep-pinokio.pl/web/uploads/files/moliwoxitemerigaka.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/sawuwenanafubutat.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/gituzi.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630085023356672394.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/82480057610.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/76ec90da7c9ef132a30bac2c80016e8c/mazegabotefavuvarapazi.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/xutefa.pdfIn PDF document text
    • https://aedwea.com/upload/foto/8508367637.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/16121264314.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/xibidilafaviw.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/2c3e33bab347b6331127049775e34209/56575974527.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210716_9FDC7462C275F5F7.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/42456448205.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8o9upajbj4cumq8jcmq41b3d1/jaferivepuxatuj.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/mowilupizonu.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/xuvilu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd7a721d0---sufejoremezev.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073452b942c2---88748904168.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/52449837558.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/84747431931.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/xopej.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/witukonubiwegu.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/timusilusok.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/fizinus.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c95b7d1951e051407ab71d67b89e5ab8/26636028656.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_off00012a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A15 10384 bytes
SHA-256: 215b7afd42255e90968eeb386e9ce19b08eb8b429a5b5ec1b34f1ef1eaf846c6
font_01_sfnt_off000141c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C3 18624 bytes
SHA-256: 42d2a6bff1111e63bbc173d675cd5b499ec3e1d611c9d86dd5c491dec0b13fae
font_02_sfnt_off000172d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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