Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62c8135d45ef70d…

MALICIOUS

PDF

86.4 KB Created: 2021-08-01 16:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93e465eda6ecb5bb29ac2945cb4d673f SHA-1: 59832bcf857c369f4351ca758bf9709b620484c4 SHA-256: c62c8135d45ef70d634611765d1c99d214b2806d9b9fee2ea8015f8f8e003ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. One URL, https://irlanc.ru/uplcv?utm_term=8+ball+pool+ios+unlimited+coins, appears to be a lure for a game cheat, likely a phishing pretext. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irlanc.ru/uplcv?utm_term=8+ball+pool+ios+unlimited+coins PDF link annotation
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607881fadd86b---43962329119.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vupesuxikega.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ao4vs6b2h5747tlovu6l7f0ac6/pekirevekexeluzelexeb.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sejilorifegixaf.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/24557021645.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/zilab.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/40137983890.pdfIn PDF document text
    • http://industrialdevices.in/uploads/98883615419.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/fedosafidatezatetanodod.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16071111868e49---90969302429.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/70973217375.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100fee448996---19274220261.pdfIn PDF document text
    • http://dges.in/userfiles/file/84011934144.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/23010896362.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/50472337000.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021621105968780.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/zesudalufixu.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/99593696000.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/3iikqkhvee7s9c3rgsmtebmidk/99386828449.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ce25a4c869cee9a12b70cab91f9c0981/warofijoxo.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4d4e8a9c842b702f8b404b320c70ede6/supakajabafoxixegev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 16556 bytes
SHA-256: 454e02f1188080b53e534bec0b19fd6fac9f43b75ea5d2980c040fcb5b1a4485
font_02_sfnt_off0001322f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322F 10924 bytes
SHA-256: 3ffa28e7b5731a0c2d4a7226221ff5d79688703f6ee5a5491436efd0cac5b977

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