Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb7907ce55fb3ef…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 05:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b025e17b6245ee668101a8e24d4580b0 SHA-1: d233706083a0408448c8e18dabdb5b0e55088500 SHA-256: 0cb7907ce55fb3ef7458ee0925d50f71c768a3db9da8a8b26fd944b9d740ebd4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links on compromised CMS upload directories suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://baobiachau.com/luutru/files/galemobizogusamudezexem.pdf
    • https://shopinhome.com/ci/userfiles/files/rujetem.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d444ec186c---xobik.pdf
    • https://advance-pack.com/editor_upload/file/7862313281.pdf
    • http://woorymart.com/userData/board/file/36255359619.pdf
    • https://mumegram.com/userfiles/file/jogamerakozawa.pdf
    • http://mikomisushiwc.com/uploads/files/70741040979.pdf
    • http://anquocrealty.com/uploads/image/files/92033859504.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c74f0de23e21a0a814ec95976787b7ba/91311412853.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053eb93d839---kozuxatasulojajiluwuwinam.pdf
    • http://duda-tech.pl/dudatech/upload/file/61537520675.pdf
    • http://waltonjohnsonfamily.com/clients/870437/File/99353143301.pdf
    • http://thevelascofamily.com/clients/11614/File/joxofetijifufelaxo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607706d6699f7---19172755301.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/148bb07234bbee1359de434da15213bb/zegujubuvadivanolapene.pdf
    • http://waypl.pl/upload/File/31417253397.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d438268d36c---nimilezavixu.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/40798665131.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160950055d289b---tiraroramep.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/j7i0f8mm7hgdgsd3pv7gbs9096/16156712942.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ergorapido+ultra+manual
    • 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_off0000ea98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 16792 bytes
font_01_sfnt_off000102af.bin
7135f365b64b8a28dc7f1651765cf10287a2f58171d1cf009e784be6da234e73
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 10516 bytes
font_02_sfnt_off00011a45.bin
22f31f544ce651a2932ed771a6f106ed7a8ed7930fb3aee259cc50658447cf7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 19988 bytes