Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83272e94e0228da…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 15:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c6f1bde5e4cf2c3967a81429043a4451 SHA-1: 50ec95a63e8ac7fa4270fd9d11d924c98557c95f SHA-256: a83272e94e0228daec2fb0cd0bca18d8fa063df98bd76c80b4e642d7df59afea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the document's primary purpose is to redirect users to compromised websites, likely for phishing or to download further malicious content. The use of compromised CMS upload storage for some links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://pistant.ru/uplcv?utm_term=slightly+collapsed+lung PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b362a2aeef9ae11d3643f2184d24deca/zinapujilabaxilub.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ff9fbfa33---daporewurodufomenezanaj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071722fc8022---69932617546.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae029633d8a---72943400532.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b343275c8---dakuberawepafidoloragipiw.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a40e547e---ponisaposubugasek.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1d5nica2nreg68cg3qlcg25csg/jobaruzukabolaxowujonav.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ldmitn47bb135nbhtdbls3t185/rojuxuwugaxotorijat.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/tabozimejaniwi.pdfIn PDF document text
    • https://panama4d.com/contents//files/bikop.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43b268c9c---jatojojotave.pdfIn PDF document text
    • https://xistenze.com/files/files/67826049576.pdfIn PDF document text
    • http://edgecs.net/documents/24529590553.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1d1a5a4ff---mibefosanifuloxo.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/229718008.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/88744084861.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/vovopumatowip.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/925ce48caad971b58f060686f45dba32/kofemavaz.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/mixalurikitugexokeduxug.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/pirifomidefobasuwusik.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b010bf67b1e9dd47fc1b2450a04c3dc7/nizajem.pdfIn PDF document text
    • 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_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 10984 bytes
SHA-256: dc391afaf26248a682831b453c69d565f7280c6e0be2196b49313385a7d557ad
font_01_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 17676 bytes
SHA-256: bde54ab31519422b767d56282aafda4e83d09c3647a19f59bd3c5fefb0340f06
font_02_sfnt_off0001425e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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