Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0720b5dde54c0b5…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 04:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d191a4970a57f728760130efd4fe1a2 SHA-1: 1e2d400a8beeac059443488104a3ccbb61d70b43 SHA-256: d0720b5dde54c0b5c31a66ac89aed33a901da5ce50b444e2576af5127d8a575f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a47040c5---bixoz.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a43e500f7604d55dd7eff9d0af6a4b6d/5961302521.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec3d812ef---fuzesinaroxivovivipolido.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c48e0f4a---76951453784.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e43a6860ea85e08d89998edbf8cd023f/69970911028.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825943dbb5---4193754702.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105121300367264.pdf
    • http://learnazia.com/fck/imagesfile/59225869861.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de4db9d81e06024b13f8d094c7cb1f47/51343392082.pdf
    • https://www.tunnel.de/files/uploaded/file/dokamiriferezuladena.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad5d8e921---komoduguwadekaj.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cd63957e39b8c2bbe905ae8580406c30/kezezorafesexujuk.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a83ea981---84973243772.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad15e4e94e---98951297812.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f5d8169a6fed3dce7bbdf85a97659476/31480598536.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/oap25i3dtqp0hgg9p5ihpho9um/80042198566.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/7ec2f661cbe85da41f45e07e0beeb83e/relov.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608785f338d7f---13311414708.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d25d9acafbbe54cab121177f3798d679/90709064418.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf38d9e244---gubufizud.pdf
    • http://bright-inter.com/file_media/file_image/file/kudevezoranokezitomoxus.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc07e3405190c3659c03ea1fbd8e13ee/50634529591.pdf
    • http://motorlustor.net/userfiles/file/26449148069.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c269d1aecb---72407699313.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=example+of+water+condensing
    • 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_off0000f47d.bin
95baeeedca50c65a8ee2dab2cb5d1c4b33719f06cffb65562e7f4aee2f44d15c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 11136 bytes
font_01_sfnt_off00010e55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 16792 bytes
font_02_sfnt_off00012667.bin
e08ab365b3674f310a82a7ad70bdd4f532f2156da729bc3360b0bf83839c3847
pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 17300 bytes