Malicious PDF — malware analysis report

Static analysis result for SHA-256 929fda5b42dad370…

MALICIOUS

PDF

84.0 KB Created: 2021-07-01 11:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df9c1ab59a15ed2b6c49fecc554db3ba SHA-1: 31fa86861818d59727a763dce1660bec67a79cd3 SHA-256: 929fda5b42dad3709b7ec74924b04c6323c9459796f555c98cb934652f793883
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious or phishing content, serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a4d46f6c---wigovorisekutusalenema.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795db4ccf52---7087747325.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9adaad527---25077437875.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3jfe1n18l8m9uc70cusvhc4fqp/kozuxabos.pdf
    • http://a-swiss.com/upload/userfiles/file/33896908007.pdf
    • http://heibldr.hu/FCKfeltoltott/file/79685421934.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1664bba9---nakamazawekujazawometile.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebbb7dfa0d---79057220770.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/mugosemoguwisojozaju.pdf
    • http://lamorenj.com/userfiles/files/fabuwefave.pdf
    • http://sdds.be/userfiles/file/14500141600.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/53221893461.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v76ntaqcc37erelnt7na4klba3/gasevagu.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b4e7a3df8b3275ae688f9dc7c03e5104/xekumafowowebur.pdf
    • http://esejsc.com/upload/files/9341261262.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/32c94aec6e8971f93ea5899d746a8168/36400612199.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5068a5db4b---6276169564.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23897781c45f2f92543aa9bc50796147/12722232642.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc67724403---92874673297.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/q7d3m2adv530c1sqqkp7ol16s8/nepilanipigigiz.pdf
    • http://bigband-ulm.de/userfiles/files/47554171729.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607c859896161---sebovudumazivepolisezopu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=combining+two+pdf+documents+into+one
    • 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_off0000e548.bin
e491e8c61469217eb55b2501433ee3e41bbba17fe84535859c4ce03a8cc0838b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 16944 bytes
font_01_sfnt_off000111a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 16792 bytes
font_02_sfnt_off000129b9.bin
ca2d97f84b2d3836aa87e30388efbc877ac5b4429228f733872c3a821942ba70
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 11012 bytes