Malicious PDF — malware analysis report

Static analysis result for SHA-256 956a2203992afc05…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 22:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 498def29deb35c717b9a8fe52b4cc786 SHA-1: 4a157484df932db7f10a1a78b3c2c3cdc1badc9e SHA-256: 956a2203992afc05aa55858c0e6596e55bfb9bea22d358d542aa6ee574a86576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure suggests it's designed to lure users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2945adb83---bubaganagibef.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b280a034288---20817851463.pdfIn PDF document text
    • https://mfdesign.hu/files/file/govatogasedasapulobe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j459vm6at1f78sn041livscoui/xunelaginidojigexegotaz.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/derevexu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be746d40ec5---24687170183.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c8ea1b05---bezalofapezavotisotibuj.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/fuxezenoruvadokuweg.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/97790012409.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/poxizad.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2d95676462b35fde7f46bb5d6a45ac63/20095297648.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2040071585.pdfIn PDF document text
    • http://pinxedien.net/upload/files/poxufumupofidebipujog.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ae016808---91940959989.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/megavijepirosefamozukavor.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/108b82a6041bff815d4dc525197a9bb9/74295361256.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dc9c2454---rajagukiwenufawejakizalup.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fcc8b91429fc7fffe5df65f7662dcd72/popalopizafokujiropopu.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/80169420797.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae95b158a07---45752860914.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3f248200---89519499887.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zewopixi.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/69170327930.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/pelun.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/53252953230.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/hqsdiq3mh74hj4bf3dnbb4rdh2/sefugakibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=exams+daily+current+affairs+may+2019+in+tamil+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 17924 bytes
SHA-256: 3b5845766144a6a0076073c6a6f835baf0e17fe360da59d42aee885f7f917b04
font_01_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 11420 bytes
SHA-256: 85ced4852676509eacd9bffe0070b52f721399f862fbd73c0653d78d9294ba32