Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc854442b41133a9…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 05:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f1f987fbfec28c3194dc0765864dca6 SHA-1: 1ba4ddd84f7b1cd4f5ab076a7335bc35634d7f7a SHA-256: cc854442b41133a9303724e67a693cd6f29ed4d931465f6f8ceaf73aca5e1af1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e9a201f6db658d45013b924558a6658e/30134966121.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c6411d0a---kuridibifokexurujupajis.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/mafogofewakibedewi.pdf
    • https://betenagro.com/sites/default/files/file/suvilizoxogufamopoluvif.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad733901f2e---87288685983.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gsquhnmarfbvklnctt47s47ds0/niwixakefosedokadepagaz.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ff943d6d---matepasipit.pdf
    • http://hum-lucknow.org/test/fckeditor/file/29318731902.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bab95a4e366b6967d03fc2545c8b167a/35566009755.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160979244dde34---kutenozibofigazov.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e3d37136---zalojexusa.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6c4dd7f19fe24c577679d49adf962212/nepuremaxeresarawagek.pdf
    • https://xlspandoek.nl/userfiles/file/posolenefoxalipobe.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d063a6af---41162184167.pdf
    • http://redactron.com/userfiles/file/zifawunurotefujumep.pdf
    • https://arte-salon.ru/upload_picture/46007795427.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c3413997bf10c67748f602b655d6e31d/vilole.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8cd2s9k1a16shit34sl2tu49qm/96646213929.pdf
    • http://mega.kz/media/upload/files/subapibup.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607216c97afce---paraxirusikigawipomupovel.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e762efe5---92824831412.pdf
    • https://shipnhanh247.vn/asset/files/lojijonuxijo.pdf
    • http://a-swiss.com/upload/userfiles/file/45624024989.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=blue+crested+cockatoo
    • 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_off0000fc1a.bin
f662c448c53913f104aa610c72161bbdf206f9512dedba64a4849e640d85078d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10412 bytes
font_01_sfnt_off000113ee.bin
ec6048fc5a24908df5b48aeac3f7565d1ef892e31c63940d3e3edb8c5d017127
pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 16864 bytes
font_02_sfnt_off00013fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDF 16792 bytes