Malicious PDF — malware analysis report

Static analysis result for SHA-256 2911f66a28daae69…

MALICIOUS

PDF

84.0 KB Created: 2021-07-04 20:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e55910d2bb347c1615781a166c583cb8 SHA-1: 0fe5c7ba0d4323f8c40570f064276c2bdbb34217 SHA-256: 2911f66a28daae695395782cde3a21f88cbf3c98aa417d88917fac92989a2c43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users through these links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://metallpress.ru/files/xamonet.pdf
    • http://ccforum.kr/uploads/file/1621646963.pdf
    • https://asset-books.com/userfiles/file/zonutexojuve.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/82a1349676a5b3608082dc4452275f9d/labudinulutipagifiw.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fo2rbrj8i3hblhhefnn4jr6au1/nunovorenalokojolato.pdf
    • http://4bx.pl/public/file/pimuwowomefosojuditir.pdf
    • http://rockpapersun.com/upload_mce_image/file/83229685959.pdf
    • http://fsoa.cn/userfiles/file/22453668984.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607999db8f2cc---23106643898.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c7367c22---83944513955.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e948939e008e1e6b59fbf0c648123ba6/75355247877.pdf
    • http://vimbark.sk/editor_uploads/files/madag.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1fed02d5---49113267535.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083edc29ead0---33564351057.pdf
    • http://debden.org/userfiles/file/mimupuxuweg.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160927187787c3---6287579650.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfc51d3f2---19716786946.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/rl7aqgar1aqvo6s3cvbeg17rlt/70322525327.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5ebc03d0---66740755833.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731693465c1---fejajidozif.pdf
    • https://study4student.com/cache/fck_files/file/filonowo.pdf
    • http://hrzservices.com/uploadfiles/file/gerivowukebojakubadutemiv.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a247b1fc---lawinadi.pdf
    • https://mintowncoffee.net/uploads/images/files/nirevowibudapisojuwox.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/77e18ff3556f8276782f2d80ed6de773/zobezil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=signs+of+platelets+dropping
    • 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_off0000e636.bin
18ddfe570f830c0b8022283ea30ca550daa914e1ef6fb08270bf5b452f320c30
pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 16756 bytes
font_01_sfnt_off000111d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 16792 bytes
font_02_sfnt_off000129e8.bin
dab6ba519e0891d2f587a572cc55069d67bf0b57cbe0d71a129e44592ea55221
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 10748 bytes