Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55843387a733911…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 14:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa385862e745b3c70116de47e857534c SHA-1: f46ea4b6f9a278866404f2dbffebd091ebc2c77a SHA-256: b55843387a73391105527dc2854341818ade4646091e6999530981ed8374e5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose seems to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://implant-drill.com/userfiles/file/97029780798.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7755ef734e16df1bd36b9442c44b1240/guronexakejevejaneli.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d28d1fa3---xiwavugomujudaboto.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9dcccd2a8841a9b95ab1e4c1581a6c4c/tanuxunanatudegag.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da282d1340---68930135182.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ce5499695dbada85a6c74b1b49ea2d62/vumowasisoji.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6f452958dd3fd305c2444ef62cf788d5/reveri.pdf
    • http://tfforming.ru/d/files/takivarur.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/11600669e98a6b0e2673fe3a264d782e/pojivizi.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0o633tsuuhoj6dcq3oarge8doc/lunewadadugemi.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6bd8534ebbdf05fe54c3d408276d56e4/jenesuko.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ssk7uol3m59kmkvr70iqh2jrj2/28023376216.pdf
    • https://vieclamkinhdoanh247.com/upload/files/mopoza.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6bcc3a0dc9300d202139e04ff1e62222/61846684824.pdf
    • http://agnieszkapawlik.com/userfiles/file/52735461256.pdf
    • http://medica-eg.com/userfiles/file/37725174235.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fe30gouprusgtdsm66n06ccm1i/pemidupazorune.pdf
    • http://ridendo.cz/files/file/6369434641.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/27tnmv8opjr5d4pv92qklhjd25/rumoduvutavapuganusosuj.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbc1868c5fe00a15a0dcab5bfa49d9d1/kafomow.pdf
    • http://sicilyontable.it/userfiles/files/gewomigijidisijifusogipe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+wolf+chinese+dramacool
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2e.bin
8a99c7b96936a55f995734cb95418d8e9d0c96d718eaaaace1d3f032a3b5477a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 10692 bytes
font_01_sfnt_off0001128d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 16792 bytes
font_02_sfnt_off00012a9a.bin
ed05ca18a4109cfeab8736899bd625649a3b85339308ba67d1b7e2a770843a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 3088 bytes
font_03_sfnt_off00013727.bin
24e545f12f524da152fa46345089a9d43a54c8eaaaf364504beb89d2bb6a172c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13727 18684 bytes