Malicious PDF — malware analysis report

Static analysis result for SHA-256 952dac0666a8fe13…

MALICIOUS

PDF

84.3 KB Created: 2021-07-27 22:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 830bf0dfbc74ac44e904faab07c70991 SHA-1: 1ee7f87fa197ee48acf953a4626746b86dbbf64c SHA-256: 952dac0666a8fe138d5126c68989fec8ecf7fbcaee6ab07d68a563cdccf773c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/7c13be2bc2779b424bad88e8d23eabf9/81763767584.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kale3eeb94enei7e82jsl8vuoh/52864663070.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/43497647225.pdfIn PDF document text
    • http://effektfilm.de/files/file/buxilurosujekenar.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160746c442e4e4---gimosalazixujiluxiwuga.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/33f1559d1948d2bb26f856f10f119709/gexujeku.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/45b515a845d8f8f594c45120a27883cd/rotejaretegatopabene.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210620_72E018240C24220C.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d42a3c55b---gajawefama.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/salerasusumebovasipexipu.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/bopexovabojanobuxaguj.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f559ebc370ea13cf5023b04e449238e5/duboxekadidukizidosabixe.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288397e347---58893498158.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/76314912552.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6bc0f30a0---79541186144.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d642fcde---31335693599.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/9335175843.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/felupenofunutefi.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/72139104995.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088047020852---rimus.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/tavuz.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/velige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=black%27s+law+dictionary+12th+edition+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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 11268 bytes
SHA-256: e0980d7f67f6df928774fb65d8eeb69d419a7bab639e2ad984ce2f249650f792
font_02_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 18352 bytes
SHA-256: 1f107757c947216a64907660d90a2da31bf922b4efb76a7fcb91669a533c504c

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