Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7a183b1afe9c8f…

MALICIOUS

PDF

87.4 KB Created: 2021-08-25 00:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc2fe8f97762a325b5e383d5e5294122 SHA-1: 58eda901c0da20c2a13120e57e97639340468727 SHA-256: 3a7a183b1afe9c8f12637284ce89aa6f72c62cd2b27be395a6d90fb5f0517a2d
196 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, is associated with a PDF link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/04340ec44ed76a1bcbd1f511fba1685f/79681099193.pdf
    • http://cnmrobotics.com/files/files/zasozujenoduda.pdf
    • http://stevis.cz/files/file/felinanada.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb956886---31025585222.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f8d7d8ffe---banowagonubej.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874fde0e813---nijitodifufutofup.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3803920001---bomalusebebewo.pdf
    • http://landia-print.com/pdir/file/dadoxapoxatis.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d907b6f49c---9924821832.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5601415413ee852186259352447f6761/wigidovasefakemoge.pdf
    • http://autosklo.sk/pictures/file/tebadi.pdf
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/22906211039.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/92407278762.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/defuxedowuxi.pdf
    • http://sowa-architekci.pl/userfiles/files/82252109843.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef3850866---282747441.pdf
    • http://kursadowicz.pl/Upload/file/bakesuxunegovokanevu.pdf
    • http://agataklimowska.pl/userfiles/file/56796908221.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a2d40448b3e75b2687e56fbe4eb9a386/6520139195.pdf
    • https://strechybenesov.cz/content/13197570169.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7e37d226---26227978151.pdf
    • http://astro2sphere.com/admin/images/file/musagi.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f48ba5ac7---lisukororoveronovobuduw.pdf
    • http://purepassion.pl/userfiles/file/59052282664.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0f613452bc1b4e5d4595077dd6996c1a/kabugo.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/236a8a9ab116fbd64993e590ee9bdcaf/sakusimi.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/2372657662.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chase+the+ace+how+to+play
    • 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_off0000eff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 16792 bytes
font_01_sfnt_off0001080b.bin
fe1a1129f0cb6ae4f29f695ff32bfd7b955ae8e36eef1787027155c511eeaf2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 17256 bytes
font_02_sfnt_off0001354d.bin
b2e5ad17c2fa14435958ae17b651589b71a4cc2889071b26350f2b480a14492e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 10408 bytes