Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c774bb8874e828f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 05:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ec47e61d803463b2a5f5a1ec95443b1 SHA-1: d701fb1203382a668bb0dad0f8614405e1fe8a4a SHA-256: 3c774bb8874e828f1f75dc3cbb4c3dcb588fa50474c8b83710381b0de1822869
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aymexco.ro/ckfinder/userfiles/files/bolenipapugeli.pdf In PDF document text
    • http://abwninemile.com/uploads/files/mogux.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c782541ad64---rovisujoluju.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b523cb9b939154dfd775db371fccbdbb/zutemixofigoxaxapapopale.pdfIn PDF document text
    • http://soupworld.de/upload/file/daderixujalopogiz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a2c17fc76---rawumisakelologi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f856efce3---73559789784.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xitegadif.pdfIn PDF document text
    • http://firegallery.ru/img/upload/71981629066.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ec4b84b3---93807293721.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/50198376708.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/balevaniko.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tenesovojejebuku.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/22819139028.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wisekuporigawenitipukubuf.pdfIn PDF document text
    • http://blueyee.com/upload/file/230356289956.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa06738a9---xovofuzofunogepuseziza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e77163c794---wuduvukixowevowigif.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/wumowusojibukivamag.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2910b887ae---93671477189.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/85104270966.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/16352774741.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfa06d871---28856293150.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hu9tf62c592oev9rakqdprbmiu/16455523431.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7c9b52d0a0ec10c63eab804eafa2da1d/demevul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=collins+easy+learning+spanish+grammar+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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 10992 bytes
SHA-256: 51daf4504e600159b45546491471ad64d9fb0c57332c8a6758fa41328ea4791e
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 17632 bytes
SHA-256: 7f790410824c24b5c3729bb960ccec62b4f3f680d69ebc7d111a82fd8067f7f3
font_02_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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