Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da6229b92a9bf9…

MALICIOUS

PDF

95.9 KB Created: 2021-08-15 05:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 099d5ea3f0066d19a3b12721d61ad85c SHA-1: c2269a2ff2c0af03ba78e6cb623485d2ab598a55 SHA-256: a5da6229b92a9bf9d7c2d2184675e8400af9dc02f2cad12474bc5a366fe55077
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://beulahcooleycollection.com/clients/870349/File/70268023982.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/desigp9pl2fe0l6a2bnqvo6ngo/98231420162.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/lonerojibakusuvudowul.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/juwuxatesolejurubigoxu.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/50020761853.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/mizovel.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9c4aa99155522ead2fce29a83a883a40/vemovavevemekomeruterejeb.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/kawomusux.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070feb7b5387---29723655385.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/84172397760.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/zimot.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/bufudufugatuta.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/6427528437.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6e6r335f536g22pv67eb7um75b/kavadikatetoxomega.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/f6s63sc49mpl9vsoc7euoga3ss/saxesanotovivukedi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/65198922006.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/95248837821.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/69521352137.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/46bbf53b3ee48a660b975c2c604b8df7/30375778198.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qrua8tuka2grk3oovpmch8n8j0/6898274820.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e32172fe654c3f75154a12a0f7f1efab/8546588596.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/67u425rm3lguutmg5q63igvndk/betewokuzasikesefo.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/20418778657.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f75f198ba---lejojawinilemas.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/89514876476.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/lizaxifijaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=regular+and+irregular+verbs+list+worksheets+grade+8PDF 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_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 11264 bytes
SHA-256: b945652bc5ba6c3b76ad902966cc25a192a745a3d51f8a7ee28872c18c9c697b
font_01_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E06 20236 bytes
SHA-256: d250773b9cffb48925b852b813b32ef31a21f10cd21058236f6b3728a8d12ff0