Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23c126513af971c…

MALICIOUS

PDF

104.6 KB Created: 2021-06-28 22:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 499339b994e9666029adbc0094cb859c SHA-1: 896216cd12bb3c530c88e49b5f60e23ef5714b7f SHA-256: a23c126513af971c64b663f2c6e8fee3d55a8d5c78d3dbec5ffc51b8cad654fa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, many of which point to compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/30c188e75781679abd09263eb67dba87/41609183817.pdf
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/36580723695.pdf
    • https://balajitutorial.com/admin/userfiles/file/jezazas.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07ea83a9d---pabizusalobajixowudiwut.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d814d1c13cd---73060392265.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a568aa478b2---tigefimupelet.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/1ih2o4hgfkuhub5p3v8s76uvsn/74926210109.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094ade950aec---60994959051.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082704a7f50b---47074497611.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b57e58253---gejuxuberit.pdf
    • http://aliceinformaticasrl.com/user/pages/geweremiwetute.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26fdde06c5---99059839908.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/60b53efba130536691426ff91b2b4c46/nafebaganekumonowin.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/109d6abd203f1b90b194a8b10a0fab7d/36279659531.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7f2fa57f2---46732589133.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e58f83c94---petafofotatadasopi.pdf
    • http://csptech.net/admin/userfiles/file/bikosugozerodekuba.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712d44870e---81062317194.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d1e1351c39780d971db5f715daf7d343/nowadetetozolotaxi.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26e135f71c---70810464221.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kjdvdldpjf73sf3io7hvi2rm54/savuwezibusef.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609570c51038d---tepefuvonegipedesifo.pdf
    • http://georgekoldun.com/var/upload/file/weridefowiwovagibuwabila.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbb971547---gubewole.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/kekifufexadinof.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92fc667cd---wasegodugaxopijiziw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jesus+is+a+gift+bible+verse
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/65961c18f7a5366081c5f1a39774b70d/69851836587.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_off0001351a.bin
73e61ba3c551cc482394ba9a846331a617c78226794163ab729caf9aa5a1cb7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1351A 10460 bytes
font_01_sfnt_off00014d08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D08 16792 bytes
font_02_sfnt_off0001651a.bin
7896fa71fbe6e51a8a6477fbbc1f28185534d87bb0925a7d877ac3e83f9b338d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1651A 17800 bytes

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