Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9aaebef1930e507…

MALICIOUS

PDF

104.9 KB Created: 2021-06-27 12:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 634ab13455c7c854b30e8dc73671477e SHA-1: 6a8c112e308a6579191541f2622dd50f10570eeb SHA-256: c9aaebef1930e50734827006e29d036c50ab182feeb47fec309c2a73322a014d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and disposable hosting patterns reinforces the nature of this document as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/31125kvsk5q5rogu7peapldob7/kabaxodorolaloza.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/928d06787a03f08a00c51f15f89a674c/raxudo.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54db1dcc9---69360493545.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/3472618d5115564bbf26a617cb83bc4d/judigofadamopur.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929abf94f46---29994440600.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/20c27baad72e44b0e6462c3101cea513/fedib.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72db6a5b1---33157995139.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a6e227a5065b4bec9afe654a69c368d7/duvovitadifubiwu.pdf
    • https://tajeer.co/userfiles/file/dafofaxelalolo.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/3t167oa2ncfe4bf4j1ka6ppff7/susaru.pdf
    • https://bmw-zona.ru/uploads/file/fatujapodi.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/319175d44a6357ae0d76ec3f393c5b35/58213176417.pdf
    • https://muratay.nl/userfiles/file/46238804382.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ffhit8fmdfbea18nk1iqkf09mf/virapejet.pdf
    • https://agrimal.pl/userfiles/file/gokatexowuzeliweketuj.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dbe1915072935fd4a023c87e89d8831d/filogurofelen.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/807e4222339217da5253e3d0bcf1136a/21737632148.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/i5n8ag8lpm186c99b8p1tpc7h0/turozasakukudibararamewo.pdf
    • http://stinpo.com/ckfinder/userfiles/files/7928335861.pdf
    • https://hchoanglong.vn/userfiles/file/53478987769.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091feb715fe8---lipejane.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e1523404d4bb44f5d1543500193fce78/defamurowoxagunezuwivap.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3p1ualv14q2uu9i11fns189d99/juxow.pdf
    • http://akcjonariusz.com/UserFiles/file/tujirodifemulabeje.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae34f6edfb2---53102896529.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=photo+collage+background
    • 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_off00011de1.bin
bc7a4ebbf81381107635fbca3403f6a9d3fbcd1f7c02c41a6da1ef1f5e849087
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 18704 bytes
font_01_sfnt_off00014eb7.bin
49c0aeb2142cd996f84bafc7c85c1cf8625673a9580b4c74e956aeb8ff0674ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB7 16384 bytes
font_02_sfnt_off00016514.bin
7134dfae9a1a5c865b663bca269fba98830deb9a6325487a736d5197b6450205
pdf-font-stream PDF embedded font (sfnt) at offset 0x16514 10720 bytes
font_03_sfnt_off00017d7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7C 16792 bytes