Malicious PDF — malware analysis report

Static analysis result for SHA-256 a042428714685ab7…

MALICIOUS

PDF

84.0 KB Created: 2021-07-10 06:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbdfedb60f66eb700785429b6729b313 SHA-1: 02bee533a60bc4b8fe2bc1057d40c586be4ace98 SHA-256: a042428714685ab76b1f99e817ac2da635b8b7df55fca47b06b3e9a395256431
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://retroldn.com/userfiles/file/80110666.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5d848e70ccce4ae823fa777dfb30b00e/wigekagabazu.pdf
    • http://bjjiffy.com/upload/zepatuw.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a53ba54a7---88089504138.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74d42500d---63892602494.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tj0h5kfd7l69iqfo5i3np1rvk7/judip.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af8271660---94012422095.pdf
    • http://csptech.net/admin/userfiles/file/nugukemelol.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/270ml1et551n16rjgegsq85m22/95746986835.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/54198919735.pdf
    • http://eprdel.cz/userfiles/file/xoxozurediz.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091159dd8c09---21644666389.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/5d473433f847217ba1bffb033b39e7cd/73184066882.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8c70cdb7e41930bbabc3fa66ce858b78/taxes.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tqua5rr5lv3fpi74j9ub776m21/93624639306.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffe9818a6---mizan.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd426aac430---32995776615.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e816fbb2dd0---35846674432.pdf
    • http://ydis.kr/userfiles/file/062310559959.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/84458542194.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f7ao83hns3gnjfhglumpt7i6fi/batebopurosepuwuj.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/008ea02a290ef01cbe59423b6ade3a01/503129456.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=customer+satisfaction+questionnaire+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_off0000e5f5.bin
55359f790d1c00ce50741ea19151163b780493f72e728537bb8aa20c96116dd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 16720 bytes
font_01_sfnt_off00011160.bin
736a37809b49b4cf8906b238450ff48d1d0f959bea83a6a127a8a7c502aeb315
pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 11012 bytes
font_02_sfnt_off00012ad1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 16792 bytes