Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc346605585a6b28…

MALICIOUS

PDF

92.6 KB Created: 2021-07-04 02:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cdaf9eeb7847af187d7bf6ccb58e760 SHA-1: 3c33fe26a1cc010d93e7444577d5ecee1a9d8507 SHA-256: bc346605585a6b28d2885efccec8be120a23390a1408045a7c2449faaca29ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL findings are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://alihuata.com/userfiles/file/63790873096.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a331cada---velumalejeluwotafufinumax.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608212aaa450e---50054992546.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/04lutkvgthslfng56iksd4ihcf/94644357990.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbcf24c818---47596843579.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3defef2b06---22199788814.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074370664771---73630547289.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d6889bd426d---36351304313.pdf
    • https://arch.ua/ckfinder/userfiles/files/fawotes.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/16911425335.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bc8778378ec6ecc916ed1b9c98d26b9a/guzupebafewava.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5cbbc193180f96b301540cd6c012225f/romemomokanekivedogupo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9b481b54---82303092777.pdf
    • http://teknis.it/userfiles/files/58634423640.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50951622896.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160786df08f847---20228405225.pdf
    • https://advance-pack.com/editor_upload/file/zunefuziniza.pdf
    • http://elite-nails.pl/Upload/file/68724358261.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33018e61---30508376290.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/dcbd607a5a9c8c8c7a62de6b2b44cc8f/xoxalipapinodewapu.pdf
    • http://kwartetproforma.com/userfiles/file/degidame.pdf
    • http://kimandyoo.com/userfiles/file/folajunowawuborugadoroxaf.pdf
    • http://mvdeastudio.it/userfiles/files/4248189276.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2bd56299---dupexesuresudot.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607230e209ea9---sezepekaxomuwevadekutir.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/713a28cb8c928d477002d00678eec0da/1573881600.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=icd+px720+user+manual
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/19ce6fe33830fa0585b1fcc1cfd8d40e/55213011405.pdf
    • 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_off0001045d.bin
9f004029455085a8d0cf7d03fdf37cac9f6ac96a799ffd032898b44f93d55213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10812 bytes
font_01_sfnt_off00011d68.bin
17edc0c505e5abd82e110f978d2331c5db369264cfdd7f9a836cd472a267e1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 17612 bytes
font_02_sfnt_off00014b74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 16792 bytes

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