Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ada3ef60a14132…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45c924fcff61211bbd2cd23e830e4b4b SHA-1: 73a96146d4eab13d1ccb477ef0188203aae96b94 SHA-256: f0ada3ef60a1413244d54230da18f57a09ce98c5e385409e73e293aac57c06d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and link farms points towards an effort to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=steam+animated+wallpaper
    • https://slide-bearing.com/d/files/65733007677.pdf
    • https://eclearusa.com/images/file/13560239756.pdf
    • https://granitabrasive.ro/editor_up/mazafunemaminenemiwof.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/fenuzofokedopatuxowim.pdf
    • http://krupongs.com/images/file/sukofeni.pdf
    • http://www.beautyvogue.ch/Files/file/petajagumufegoridujalizis.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/jisabigemivokerilotajuv.pdf
    • http://arunimaflavours.com/userfiles/file/17538953313.pdf
    • https://pracowniatechart.pl/fckpliki/file/52753466521.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6da18056---31338750427.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/senepodefomob.pdf
    • http://linpus.com/app/webroot/userfiles/files/zumizozatinileda.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161352d916ae00---88910708110.pdf
    • https://kalimati.in/userfiles/file/78119107517.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/p4qvudaovmmt3suglldtpn842l/tunegunu.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/foxiduxo.pdf
    • https://interativacorretora.com/fotosempresa/files/95488946923.pdf
    • https://markyatirim.com/resimler/files/nolud.pdf
    • http://fedime.org/imagenes/41310066792.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/16359124509.pdf
    • https://mkontakt.com/dat/file/pawasuxemuxewaruditikutu.pdf
    • http://mxag.com/upload/browse/file/87891935212.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_off0000b9e7.bin
c1d52278f5da3f229f3f91ff8661ff426d86333658c84aa572ca9b042565d9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E7 21500 bytes
font_01_sfnt_off0000f1c7.bin
9752de01b11c5fc6b95a290648c98f133849b334419291567f4d72c31de5615f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10428 bytes
font_02_sfnt_off00010965.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 16792 bytes