Malicious PDF — malware analysis report

Static analysis result for SHA-256 8870fe9b0a638bef…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 08:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5530a78c86083822e863031bd69c050 SHA-1: 3ecd9a0f31c28bb2539d25dd3d2c2011af891f38 SHA-256: 8870fe9b0a638befa211d0cbceb9ddd02e2f105f49bb9578920be3b10758f045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=best+music+player+android+offline
    • https://realschoolspirit.net/scauserfiles/files/boxanuta.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aab2bddcc---33766891558.pdf
    • http://jrpst.pl/userfiles/file/88137999495.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/91841548555.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b035b6bccd4---74145573576.pdf
    • https://cmsschoolkg.org/userfiles/file/44923532732.pdf
    • https://fanaf.com/article_ressources/file/wuxiv.pdf
    • https://burgas-remonti.com/userfiles/file/berorigobag.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160988e932574a---20947721631.pdf
    • https://basisnomor.com/contents//files/2276546372.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/nhitkdr0ogga6kjqepbjfl4o2r/pebamod.pdf
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/38184775248.pdf
    • https://audreyheselmans.com/_files/file/jevejunulit.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/aac8f2dfaadd1b5e9aeffb59f8a36966/4148124178.pdf
    • http://bettaletroom.com/file_media/file_image/file/32115435502.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac9eedaaf---fegewabinetosubojivur.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ba4da901620908fdbb2735179f108dd5/41592294287.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2bd60b45---80427551465.pdf
    • https://victorybear-info.com/userfiles/files/61391990444.pdf
    • https://alshamiltrading.com/alshamilfiles/file/sibapejubodepesimoz.pdf
    • http://www.findvoters.com/userfiles/file/kegerijezim.pdf
    • https://torgradio.ru/new/files/file/laxularegimetabipikufir.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be225c54b---poxidigavage.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ji30bjoit137qjafqn41ulrus0/wipufarajadawejeno.pdf
    • http://cesishotel.lv/res/wysiwyg/file/4812215513.pdf
    • https://manualismedicina.hu/fileok/file/borilufozewek.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_off0000e8b1.bin
88b60ee6dc061632755b664acc99dc12992aa54c49d2bf872dc3619345158216
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 11048 bytes
font_01_sfnt_off0001026c.bin
037275341324acb8bd16697ba8dcbb13d5be17327bfd7c0786f7343d5170fd84
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 16448 bytes
font_02_sfnt_off00012d02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 16792 bytes