Malicious PDF — malware analysis report

Static analysis result for SHA-256 b992090b6a48c699…

MALICIOUS

PDF

101.4 KB Created: 2021-07-03 08:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bb6f070b34cd729c8a3053bc7f8c4e7 SHA-1: 83a03a25f63ea6c3524a5c41d880a9c7548c938f SHA-256: b992090b6a48c699ade0e4ad508b4a59e14385e8c238ed165414c372f3d5573c
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of an advance-fee scam, including language related to lotteries, prizes, and parcel deliveries. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/080df3d1a693c740d1b75cfbea6417c3/vorobusujaxinuwexugu.pdf
    • http://adamlegal.com/userfiles/file/tamapaguvopamigiwisukixuv.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0daa4961d4---9227161699.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/11427215621.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8d73f51af57c8a0b2c17442c5f355e4b/kusoluketujumil.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/07b4d73b6400ed07a511dd073fbd640f/7121212249.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5dfecd43e21fd104447701553809a473/relixizazarovozuwozorufij.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/lqi5srp2mo97eo95n64ibsiom7/99879424699.pdf
    • https://nada70.org/userfiles/file/99728563583.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098b17d77fc3---lixujorufisowupililazowim.pdf
    • http://domplus.su/userfiles/files/gowaruri.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ca22e60be529a1726d54e53e591e7c6b/mopukeduvuwezezufatikifi.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0341427c0d---kekasag.pdf
    • https://advantagelic.com/singhania/downloads/file/96762625158.pdf
    • http://accessiblevehicleservices.com/userfiles/file/voziwuzubedubirelupix.pdf
    • https://valve-toho.com/userfiles/file/90315324460.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/jemaruwepigagujazisagoda.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/06db0bed06d604b9df102714dda24bb9/zoxaze.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/01a2511dfe13a3d8d2de170d379bfb2a/tujetixifobexaxikapejobi.pdf
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/rutedeku.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/raqgovgqf1n6qbnmahtpr69dgp/35473093324.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2b53b129aa65840a5e88825ee249444e/jepexijegonil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=legal+maxims+and+meaning
    • 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_off00013024.bin
6ae4213aa08ee01ac56728489616925c80ab8e628a97866ae00662ae8aa8a985
pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16076 bytes
font_01_sfnt_off00015976.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15976 16792 bytes
font_02_sfnt_off0001718d.bin
cd7eb0a35b55f1fd8ca7fa051c07d0f903c02b633179128032eaeb22485a3f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x1718D 10332 bytes