Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c37654a87c47367…

MALICIOUS

PDF

90.0 KB Created: 2021-09-12 23:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e80507aa215cc95a30e237b10d7ad7f1 SHA-1: 4c0249be4db9ac41cd17439411fa30057172e411 SHA-256: 3c37654a87c473676cc09ee84f0f65ede459f74fa8602afaa78d72b9f66148cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://doanekeyes.com/userfiles/docs/tovuropim.pdf In PDF document text
    • http://budaors.varosom.hu/userfiles/files/19530391130.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/vevexulusijatut.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/tilunaxoxij.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613833ba88557---sanirufafetix.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/68367847535.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/rupuboritulobasumutuzapa.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/11549887981.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/19133454350.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/52326575776.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136805ff118f---20994505744.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-1/20210901165348396920.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee44bb9cec---89799412624.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/jusikedas.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/zikugipav.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/bokugazinuwuvekela.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/42650007632.pdfIn PDF document text
    • http://ukrfirework.com/images/file/87984047809.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/80323811445.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9eb06df7e84ef3c4873e33d30e8e0e7e/sefekapopedemev.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/2292910909.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/11896297733.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/butoletoxevepigirazira.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d778147a---girajuxatofesuzibimimid.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/getez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+tactical+rpgPDF 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_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 18036 bytes
SHA-256: 7bde72a9ce58134ae4e9622467c06dff1f686d7dae9d92f50131355febedd51e
font_01_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001437a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437A 10372 bytes
SHA-256: 63130066c821f20282d956f8d7a4630f26455fd39d1181824d45ef6cf2b8d4b2