Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cb440c8778c604…

MALICIOUS

PDF

88.4 KB Created: 2021-09-11 08:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbdb22887f4fb836d7eb8ded108a5858 SHA-1: 240d35b2faf3a40d4035c29d2e30789922939890 SHA-256: 88cb440c8778c60494a52429346fda3b569cb8b26bda80421ecd0b8b0fe6b882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=shadow+fight+3+mod+apk+download+highly+compressed PDF link annotation
    • http://co-wemart.com/careeruserfiles/file/2721393688.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/ladesifixufarefaginozeki.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/sowonakojozuxomatelegu.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/tezetuxabiluguj.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/30321756173.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r9lmnd10tbjue6ljp2ajl8jjk0/62701049646.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/89406257833.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a6ab6b8acd.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/fularub.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359464161d5---32261292527.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/nazakazivux.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/42592447421.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/1558681787.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/30771467589.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130bca161a54---welolojawatijoxukukiz.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mirunejemaviv.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/15210572340.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2fca95e7---15235097363.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/21835044126.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/gavitonokaf.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/42999891287.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/38341896397.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325fb389314---zanawidufigunabakimazatu.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/xofafeg.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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 17688 bytes
SHA-256: 0ff757de6d3d81298829875befee101a7ba40ceb4c7f230ac2838ccac294c98f
font_01_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 11604 bytes
SHA-256: 873ece4a8219efe710f52a9457d9f8182692fe77fcd8cf45a6094ca2508ebd3c
font_02_sfnt_off00013b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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