Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ac8b9ecc883a00…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 03:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: add0b6050ce779f132dfb8bec18c9da0 SHA-1: 74804f21314f04ec1417a60c757843f9165fb241 SHA-256: 44ac8b9ecc883a0062cc58ed7f2c1e4e0b4d4372415432a3b1ac1e006755593f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, potentially leading to further malicious content or phishing attempts. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the user is prompted to call a number. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ridozigepibojodomowebovok.pdf In PDF document text
    • https://weddingitaly.jp/images/file/nigewurom.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/79361232404.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/josojulajamuvoso.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/43912230877.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/49768635285.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/labafaxalej.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51149791459.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/97551888898.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/38166617464.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/komavafagumuwa.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/69895930209.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/wabibiz.pdfIn PDF document text
    • http://kag.fr/userfiles/file/91866671677.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/denelafug.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/pobumogasijotiweb.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b26c59afd0bd41248ba101a3bcd40cc9/fedobidatibuxub.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/dexixologezif.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/90882099227.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109140506393154.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/505ce3b8ae2ca4a2b39b3a4e5e93aa08/puvumo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd9e9ad012---57747677724.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/37513588921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+live+cricket+match+website+listPDF 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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 17000 bytes
SHA-256: 0f37f9397b0c0e42260bbd3d7e0e21a83ac2d0547466130df500bf5227cbb554
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 10632 bytes
SHA-256: 6a972d5489444acc99553c75b3d48505059a079e01eb793c59cc7cc160feefce

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