Malicious PDF — malware analysis report

Static analysis result for SHA-256 1926e1484d161bfd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 14:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c570bc93f308ac0583de6cfb4fa98f8 SHA-1: dbcb37183759d7de42ea31af9ee8a438dbdac843 SHA-256: 1926e1484d161bfd102f0069dfaee7a55132805b137df759eb830fd88452136e
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm, potentially used for SEO poisoning or to distribute additional malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a0af0b80---30456426194.pdf In PDF document text
    • http://bighost.vn/uploads/userfiles/file/wimitesipokuno.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/regarebe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dca654bd8---xibowimagapasok.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082eeb638fae---2931647852.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/45484634323.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/46046942797.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6841f19b4c4869254380f51268f8146c/95165260057.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dugefawezonubiporar.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107172101019805.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/rixiwizag.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/nogeza.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cb20ba31b74ba25e7d2f79445416fcc7/rebekozodexaboziwudawusu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/bivizesewupazoteje.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/4153962267.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vifimuxozudujideduruxuwul.pdfIn PDF document text
    • http://www.moyekolodin.com/files/53761649436.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/taxikuderubawokibuj.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8bf54699---49723135564.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/85353683546.pdfIn PDF document text
    • http://ibb-online.ru/f/file/rujopojib.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/pozosevolorerumirejesozag.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/junilugak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=positive+parenting+an+essential+guide+pdf+free+downloadPDF 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_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 20432 bytes
SHA-256: 007c50a79fb3457ee9879bebd45ab631d41a74cfca8b2a89254def55db5df88a
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 10924 bytes
SHA-256: 13670921ed9ea9fef26bec7032e8ce79f0f9485ba2560f082458cc222c8a1976