Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e378845ccbcfe4c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 07:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae5ae4d34880614ed7a3572f24d96c6e SHA-1: ed81b37e9188b8dfe58551dabf5c90f87b7ec0da SHA-256: 9e378845ccbcfe4c8f5d83ff9152a6f5231239997d2184c6e1db505f565fc7cf
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 websites, several of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skatrip.com/basefile/skatripcom/files/sozobevonagebimeda.pdf In PDF document text
    • http://retailcop.ca/files/xomusi.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/14885192079.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613004111869a---kuwosifixitokane.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/69152731378.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bemuripumawiwudapiraju.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729f9ad205---zuwisorejujopawatire.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/079df1d07118de4496e2cf8c6aa8574b/pevitomeje.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/32314182019.pdfIn PDF document text
    • http://abworder.com/uploads/files/38795102622.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e7a24c48---44948020607.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/86807233719.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bazulu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jevibamixuxepifo.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/ranefopifopiju.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9a05ca00cffe6efbbf132e54b5a2df27/tubawimafufusobino.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e377e00c68---gosamamate.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/11973308542.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/6339664122.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/wevalakofejetomezamutuno.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/9984088340.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f0a19f319---50658507555.pdfIn PDF document text
    • https://diphong.com/uploads/4695676322.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/30364259382.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/993f45dd0f3df8feb7fb73bb60c620da/4731015451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=new+bhojpuri+film+hdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 10664 bytes
SHA-256: ed7ea5790e6f160de6c23eb7c5ea5bdbdb2475dae73b8990e073ae2d7ac45166
font_01_sfnt_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 19880 bytes
SHA-256: f0929198496cb68279a5eac9e042a9350a0da799c3ee7b56c89b894d9b7950a3