Malicious PDF — malware analysis report

Static analysis result for SHA-256 50442d6af0df3547…

MALICIOUS

PDF

90.6 KB Created: 2021-07-21 14:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa73cd0118d9fc8754f201fd8a680563 SHA-1: 63bc90959c603b4aef8ded53b544279545109e69 SHA-256: 50442d6af0df3547df573107cfe85eda5c584d9467fd6067a4a4842edb4037b4
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af95d52e821---27999958295.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081dde27bed7---51867647418.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/uhmdq29me01v59gog7ic6i4ns2/novutonotewaso.pdf
    • http://phuclocvienjsc.com/uploads/image/files/94001976858.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/10491954440.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f83131a71dffed5abf0dd84de1d1b53/57198864123.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9847a0ef1---40252732684.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mbkk1eb558ava42f4olsilp8r4/20080891487.pdf
    • http://stressmanagement-karriere.de/userfiles/file/95383873272.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/oj67jej3untb0uj0b94p8e2kb6/87666082338.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/gazimaketazajon.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160847ceec51b1---33587111464.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/22388423913.pdf
    • http://pechati-piter.ru/userfiles/file/51554525230.pdf
    • https://lifetides.ca/cambridge/uploads/files/28283747624.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d08524f6f---furopib.pdf
    • http://satakantaresort.com/user_img/files/1865690064.pdf
    • http://spielundlicht.de/content_provider/documents/files/20413343607.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a503a979beb---vibejuwuperutoja.pdf
    • https://swift-tw.com/lcc/upload/files/bubasodigunemidezuxole.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa5d173219---paropopoxazajepe.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c9cae03c7---todevul.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079366dd7716---44251587353.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6b0933ebc520425e6f73445bcbeb0ef6/41944613391.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d75628d117ccdcf7b1c6ee35726466b6/90315695307.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+microwave+instant+noodles
    • 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_off0000ff15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 16792 bytes
font_01_sfnt_off00011727.bin
565768156bf04320cbc5841a5ac9372e3bf87140cdae6d853ebcca8c6f9f27b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 17044 bytes
font_02_sfnt_off00014377.bin
d37fa8f4a979482895fa40a10789816c2fc8700f6f60fa4e11e7309c9086c3b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 10928 bytes