Malicious PDF — malware analysis report

Static analysis result for SHA-256 af371d0ac712483b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 16:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38a2229f53ec40a6fdabaeef15f86b05 SHA-1: 6a88460547ab87215e7bdf2fa91a7eb81ea9005f SHA-256: af371d0ac712483b929f79bd17d29ac2f6e484e701345d13378b5e4143ca46f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://hurghadalife.net/userfiles/files/45903590110.pdf In PDF document text
    • http://kapelski.pl/userfiles/file/safuludafumatejufotow.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/dfb3e69b644bf9ba62a996d758bdaf55/mozetetefivebipug.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/fovujonujiduxofano.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vsauqr95r0me39unasa1dar2e1/rivunamevosunexulum.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/jaxerelogukod.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb80de39d---58201719700.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/suvatomitirorowajoj.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/75684700450.pdfIn PDF document text
    • http://asfalon.com/__files/file/77436250212.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/37978431544.pdfIn PDF document text
    • http://fitviewer.biz/files/file/44020501594.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/10gu46p3akgp7guoo1ua57k7j2/8026387578.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/digisefuwojafemomoga.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161217b4642cd8---lowibekopatemogajazigopa.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vanowogunevipuketi.pdfIn PDF document text
    • https://roc.mn/uploads/files/mazozugugajada.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68f72bafdb---18197169460.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/sudimekebokuwipopotodu.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/51718890378.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/dapajovenurajogolirup.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/35825499175.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/69885531069.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/cfec17037cbb69bc5c9df18c86b5d8a1/digevope.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3694336baf---99914538476.pdfIn PDF document text
    • https://ancoraeducacion.com/images/11605911.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/bawezuxonixivugapa.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/wamatibiverimipumer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+reader+full+apk+downloadPDF 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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10412 bytes
SHA-256: f0e6214952f79e09b84c4bfd409863cdb58ee3daee1e6fd2708477931fd88824
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 17044 bytes
SHA-256: 154734e449b63e4ab9c923656ec2bfd3ef5721b7a1ff2a5fb8064c54e94a74d3
font_02_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1