Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df53ee138770735…

MALICIOUS

PDF

99.4 KB Created: 2021-07-17 22:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84aeb50c0b791412b33502b61683bb61 SHA-1: 5ce22bc610881073d0b6bf0dc885bb7e0634efb9 SHA-256: 4df53ee1387707353aded05372420eef469a5a2c67c5547a8e9ebb936569fb04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://hasekei.jp/userfiles/file/bineki.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52fbe3010---pinelosuxajud.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wiwikerojatiwikunelizajiv.pdf
    • http://studiocalderini.it/userfiles/files/tewidugudizeranidebu.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/llnk1lcontbq7a34nmndh7ut1v/33815035717.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728413ee386---58910164242.pdf
    • http://oilandgaswork.com/userfiles/file/35178927779.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1f65cf56bcbbc61b9cd9d862ff06445e/73308661900.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/puzulepow.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8fae0389---kimavezobivivaregosujurab.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae6b0580b---43893642238.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7e9997af68109610fa0bd8a8794941a7/11564512629.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3e6de5f1---voxima.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5deb6d2bde---dolunutudepujezuwiforexa.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/xunimorov.pdf
    • https://avgdesign.com/userfiles/file/36586635720.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0dkk9of42lv04e4eqjm9n4ru67/81914530401.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f958f1a672---wiguwegufitumubefat.pdf
    • http://ajivikafinance.com/userfiles/file/52293763768.pdf
    • http://uniroll.pl/user_images/file/wovelug.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b413b86a82---tivil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=yup+meaning+in
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000116e7.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116E7 18328 bytes
font_00_sfnt_off0000e842.bin
9ea85ae770aefcf0e51a2d2eb9b13aa5150cbc5c228accf3d042ea008d0bd159
pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 10144 bytes
font_01_sfnt_off0000fed6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 16792 bytes
font_03_sfnt_off00013484.bin
d88883b9673a97a22bedbb0aa66c629519b43ccd282393dbcbece72a911bac7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 24348 bytes
font_04_sfnt_off0001707d.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1707D 3464 bytes