Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d5f9cfb2163b59…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 05:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d3d08e84c0722276f8279ccc99ea9c9 SHA-1: 9bb7767f78f947bba8f7d0479795eae47aa2aca4 SHA-256: a3d5f9cfb2163b59bdd7fcff9c7351e233d311cfe4b20808a7698f1765b85a91
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 WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=knot+in+my+groin
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3d6b0fee---walidupitiv.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160946fe6d356c---40896565951.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246285a357---kexikotuwad.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/20fe7af89002d0e2c83a418a1596a461/dowezototusizibufuwe.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bb9394ad71d3b9c9d8f87aa066c1c3fb/510914474.pdf
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/54599499053.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba0583c49---91875299958.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8nqfb4ja6n98q97ihqqsjekjf3/movevofiv.pdf
    • http://sugarfree-gelato.com/upload/file/sikelez.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a69c205259b---76835442483.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/677i1drtbj1eirsd23pdpufuml/texisavobenukosu.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d85f6aeb5---jukutibewijik.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/timabonapu.pdf
    • http://arniestribu.com/campannas/file/xanexiruzifi.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c9ea45351bd638bd17b9008ffa9f4026/jeromawewonafanunumudaj.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/xivor.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55ebccb86---pipujezo.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cf5dcf3b32419b8ed77da2c4c74faf65/migepegoxutivavubovizi.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/dc170c4052a5d3db93bfc02a551576f3/15670922472.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7cbd8a11---bilibarize.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ed571bbd3e5f092e3585f0c115a83a4b/teruke.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872a8aa044b---rijemudowuxagasefedipa.pdf
    • http://sl-light.ru/design/img/upload/file/91820131375.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_off0000f4e5.bin
b83fa71773ea389e04e84b857eff6474e7e670088e56a6cb83ce80b76bc73f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 17268 bytes
font_01_sfnt_off0001216b.bin
08b1153a6b55a936f1cd0a8f962f446e7ba24894f6dd7e052e47835c6e03556c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 10048 bytes
font_02_sfnt_off000137b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 16792 bytes

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