Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f78e7a4549694ea…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 09:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e292fd9c513fba7c07f5fd8d53ec06d3 SHA-1: 5a91a5ac5de4e9709a13d227627aeef1878ea425 SHA-256: 5f78e7a4549694ea0a3d0e510ad8f5f3fd0465e5e1b7e5483c8b473de236b6a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to domains that are either compromised or appear to be disposable, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xutricolor.com/uploadfile/files/45404720980.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e816b433---xosotekogotupadeji.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/sonugemax.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e6eea5e138f9c56f6cf5aeb664ab112b/dunitojowoz.pdfIn PDF document text
    • https://okazionche.com/files/48378979709.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/28b4f8ec3dafc7d169756367c35260f6/67467278749.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c88922a0e41fa113311a0ee5641a8fe6/gojedudasifovigupajoxoziz.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/o5sm2jbrprocl9246etqmucgkh/94853839266.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55781bb39---basajufituturuzixigevel.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050123060430.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/24894684619.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/bofinumatof.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1191981d6671785ce9365ab7cb7b02e8/96250052815.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0df8a2db566472d865586c95391efa84/lopumagoxubidoditapogetig.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/popogolajo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e026b4810fe---17514775607.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nekalewawoguv.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/wuvulufajivupivasora.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f7b667fc79f8cf6a4c35a33cb054d929/89980671109.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/jusonusoxikixosu.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/19546840736.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/58584029325.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/tunadipikamiwor.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b19e7811838003683c240656734bb285/xetom.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/3109034540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manual+del+picudo+del+chile+bayerPDF link annotation
    • 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 19604 bytes
SHA-256: a3b93afbaa1545d4a390a39d59094eabfe28b1c0dbddaed21871e2eb18d82433
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 10692 bytes
SHA-256: 358c97888ba3f51ed7ed3c9aed37d3ec111095d6b6030750060e7af391dcf975