Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1230165fb2a5d76…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 18:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcea527e6b702c9e1cf6dfe0ea4efa44 SHA-1: 636e1d00c6ad3f28bc45f94b55ad2a799c5fdefa SHA-256: a1230165fb2a5d76d582ecd6029e4033053adca15af4ddfd1d3f17b8e1381150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=idle+traffic+tycoon+mod+apk
    • http://gloteckr.com/upload/editor/file/vefodupufipe.pdf
    • http://f-kcc.jp/user_data/userfiles/files/68859160260.pdf
    • http://lt101shop.com/userfiles/files/86739365910.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/73f94567422326ba6057d5f697416918/gigabel.pdf
    • https://akonis.ch/userfiles/files/38146671345.pdf
    • https://firsatpin.com/calisma2/files/uploads/gexobirife.pdf
    • http://k2plusinterior.com/userfiles/97920476996.pdf
    • https://dcimx.com/files/91516091605.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347ce2ed2cd---wanutupamovok.pdf
    • http://dezmaster.com/userfiles/file/99558423198.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd32c17bf---kitipivivowerolomepekalar.pdf
    • https://foodphotoshop.com/userfiles/files/96839299105.pdf
    • http://daming-school.com/userfiles/file/gubivikodoz.pdf
    • http://reckdance.pl/userfiles/file/galixelebojaneronetam.pdf
    • http://coachhouse.info/assets/file/37021406444.pdf
    • https://itexpertdog.com/upload/files/reponosenisufatusoji.pdf
    • https://deltarealestate-eg.com/userfiles/file/34686683032.pdf
    • https://ceccarmehedinti.ro/userfiles/file/42820389024.pdf
    • https://qwert5.com/psum/admin/userfiles/file/55826769323.pdf
    • https://maintogelonline.info/contents/files/jabasutugusovaruduwez.pdf
    • http://lblussana.it/images/file/99165873767.pdf
    • https://pinyardim.com/calisma2/files/uploads/vorimoluzozunovalujiravud.pdf
    • http://goldenmallbiotech.com/upload/files/33619115159.pdf
    • http://madonnina.info/userfiles/files/53645272576.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e417.bin
25dc95fe5181948dd972737542c5d0046e12597e0c676bf7f571dec27115a7de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10772 bytes
font_01_sfnt_off0000fcd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16792 bytes
font_02_sfnt_off000114e9.bin
73b21ed82786fa8c7581837bd8b3560506fa7157457e6f8b39eb69ebe93f62a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 17768 bytes