Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fc5b1d82c2ade0…

MALICIOUS

PDF

92.9 KB Created: 2021-09-04 02:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 82a5bcbdb609f560e2e603428db2af65 SHA-1: 26dea5dd7ba34c55703108fe3893df12850fe275 SHA-256: 74fc5b1d82c2ade0c7779ff3734ac6bde82bb080c826b86e69c2c5b87d430e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/tv2o7o2phredbr8en00o1s85th/4831583994.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/21611314871.pdfIn PDF document text
    • http://bakefruit.com/uploads//files/202108102204412495.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18998fcf3---48205894954.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/talusutowojip.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/beberu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da4d74080---73651035853.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9340210810.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160886f810b8ea---daloxineruv.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/vidowekupabubewazorik.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kabuvamibujejejutunoxaka.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/57720805908.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/dfc9f5b3ea69fd3b12147c2a301d347d/vizebufigakopalupanaxazu.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kejob.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8d355fff---36906488275.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/65353284583.pdfIn PDF document text
    • http://z500.si/files/zedanidurigezavewejodobi.pdfIn PDF document text
    • https://matrixx.lu/images/98403723943.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/58732831769.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f32651c45---fanowesuvuxosemizu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62521989f8---walupanovifarusi.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/65332809889.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/ea644f2f5e854bd6ed9666a237d77e5e/nizesujozodosaxizuwuvadof.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/telukojusanuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=many+much+a+lot+of+a+few+a+little+pdfPDF link annotation
    • 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_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 17696 bytes
SHA-256: e0c397cd96fdaa0e6cc3d3dcfd60986a2bedcf6d8640409157ac90ccf6a3d418
font_01_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 10908 bytes
SHA-256: 8ec60f85f90430bc9c24d76a34fb5dfdb2ecc5106e7a33ae17c60a2108041616
font_02_sfnt_off000154fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1