Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccceca1ad3d4926…

MALICIOUS

PDF

108.7 KB Created: 2021-07-15 23:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 934631c6e6c6c365eb30e7cacdb2a0c2 SHA-1: 372cbeec8463fa1649e9cc2c186f2d26cf938d61 SHA-256: dccceca1ad3d4926711cf38a4b521f34d82554d2b14b75851e83dd9c242bc8c7
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable domains. The presence of multiple PDF link farm indicators suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dogalakustik.com/depo/sayfaresim/file/zijonepusuvulepuworulumod.pdf In PDF document text
    • http://mgocsm.in/userfiles/file/57944461671.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/88495881389.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qb01a62jicq9fum9pr8ipkcg01/42623737596.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/razirubixomoretamugevin.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/lalosidabikipana.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/62478639870.pdfIn PDF document text
    • http://hkalc.com/userfiles/satok.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/sofujegut.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7fih7n6ee6kanoejm00o6cbp22/rogubiniloradetatoziruke.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/keligorofaxeralolunub.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9d47b1eae19af96a855fe85559b7effe/kanijarozomoxar.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/nurufetozolimavemuz.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/powosokoxubaxefid.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/85982835213.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828e60e0057---84655890786.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edb21ff1f---nilowafof.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/99617399545.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d2d73244---nigufugopowopagexe.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2362c82ec---xidavawezugegimoromi.pdfIn PDF document text
    • https://mszukam.pl/dat//file/10463844892.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a63b4cdb1---11464290284.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hrk44cp1bag568e1b9d1uuq6c2/kaduzurizawi.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/17828392882.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbde466ec---buxiwebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=medical+records+release+form+templatePDF 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_off00014620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 17684 bytes
SHA-256: a5e45901985adaef44203a901ffd959877d93754f76fa6246be687ba7aa75aa2
font_01_sfnt_off000174a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 10672 bytes
SHA-256: 520b922cd86b63f3d54bd506892cdc8ee20d971de6e212f4abb021af43747339
font_02_sfnt_off00018d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1