Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c37cd49f9ce8de…

MALICIOUS

PDF

92.6 KB Created: 2021-07-05 08:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d88aafe14607b5396ccfb2a0e6c0dda9 SHA-1: 149f3f22fd7e08ecdda1193d2cf0616f0feae16f SHA-256: a2c37cd49f9ce8de43050706f29a55468fef3a602b2e673f3404bde2a406b81f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://fouladsazanco.com/Upload/file/mifabuzokujetow.pdf
    • https://baxsporthorses.com/userfiles/file/47540379562.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sq7ngh7ig91a21fm4hhah2mfl5/64974620110.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/78b60691bf6522d5324e712707f9c931/sinevoxarinijizuremot.pdf
    • http://bet-balance.com/userfiles/file/92302990646.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/772b6aa25e81a7ef09fe4cb4af2744ba/95161852271.pdf
    • https://biomedchita.ru/imeg_master/file/doguwimadetozaresatugomo.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/dumadunanemoxobudu.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/650564ae08db5645a5198dc2065aef7e/60991861997.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ab1034a9---vujibatitumivexa.pdf
    • http://humanlitech.com/files/files/51145105173.pdf
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/xotajoxedadovesizorori.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b78897810---25950383335.pdf
    • http://pampa.be/uploads/userfiles/files/gavineroxesirivun.pdf
    • https://batikatravels.com/userfiles/file/busigoponubevanisimego.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca958a937---nigidixa.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/44f85c0ce9c9b5d0d64dd4dd0f6faa2d/filax.pdf
    • http://firegallery.ru/img/upload/judetisusagiwukuropo.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/82395708095.pdf
    • http://bettaletroom.com/file_media/file_image/file/tefenereza.pdf
    • http://primethailand.com/ckfinder/userfiles/files/98466397269.pdf
    • http://synowka.pl/galeria/file/xisuzelegazawi.pdf
    • https://mahae.hu/files/files/zodiw.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff488b0ae7---3007273312.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sonic+generations+map+mods
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 16792 bytes
font_01_sfnt_off000108d5.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 16164 bytes
font_02_sfnt_off00011e4c.bin
ec362dbd96669dba178c9eced0e762d81e9d4eacba0c96eef3ac746feec79dc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 10888 bytes
font_03_sfnt_off00013741.bin
8d2b9fa779ab8caed6f879d3461fc05788d77d09ade1121ee4a2b05018af60b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 17304 bytes