Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ee4d8e59c9a91a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 04:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70cbb58c52a5464f2e8363167725b4c4 SHA-1: f6f00e4208df890be1f991100c8ec26cf40c5b5b SHA-256: 42ee4d8e59c9a91a9914c95ed32bdd4f2da6027319e8b8d3450af793c117138c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a scheme to distribute malware or conduct phishing. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yetisirkaucuk.com/firma/files/67902126166.pdf In PDF document text
    • https://guclupin.com/calisma2/files/uploads/gavivu.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/62574308937.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210905055404_1189829403.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613058bb16ff7---35344105020.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/bozarokeka.pdfIn PDF document text
    • http://charontrade.hu/data/file/90261122682.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/53656695553.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/83901720117.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/63629756125.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f43f87d23---vejigumubumadigufu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/81673347636.pdfIn PDF document text
    • https://istanajp.com/contents/files/79290852998.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13254985745.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/gizenivobofu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/lexasegat.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xagix.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0d043abcb0678bd53c976deef8026647/vajuluvivi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/84728816928.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/2327520405.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/kimixal.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/57370138839.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161309489cd83c---36377907525.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/pedaderupivatenadekuwam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+a+girlfriend+the+ultimate+guide+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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10952 bytes
SHA-256: ef0c95b5a7c065ebe9fe861e7a69c0aa22bb587ce4b4fcf5a22ea05156ebe529
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 17184 bytes
SHA-256: 16deb2b3422cd8d65bb2ce5d3b4b8f9077d77f8532d8a260d7d116721f21e0d2

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