Malicious PDF — malware analysis report

Static analysis result for SHA-256 f194dcebc7cd1214…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 00:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29271784110a5888a03e0979e51551d3 SHA-1: 63424603f715ff716b1fa9574039d189f0054d6a SHA-256: f194dcebc7cd12148cb8fecf0cbf1701bb3c35840bc325f9068d1bc8a52d56b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://queure.ru/uplcv?utm_term=heating+baby+formula+in+microwave PDF link annotation
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/iuigmbqv33t3j1lqdvt0853u1f/vixidesusikuxafizixi.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/49746425291.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9edc4b25---worulijok.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/dosafafifilu.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/6903715759.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/f2rdt6msrg32k6unpdi9nnkts2/geloxugab.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/dovegiw.pdfIn PDF document text
    • http://brukbet.com/user_images/file/83661494056.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/6027059841.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ccm1k64cr0geohrf7votac2jb5/97614266066.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/45931474574.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210525032520.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gafozo.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/72308815221.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/becc93173443ec3e0631d315350312dc/6483911314.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/wogolokawebilij.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/a1pp1smttjv4i9vm136p0nh0bi/davesudofituzuf.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/34c40vtat8ie3lnrjdfet5hn5d/36342645331.pdfIn PDF document text
    • http://c-amc.com/upload/files/zaximafilob.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dimakotifevugu.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad4c28a84---70695896962.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/fimaju.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbd950e94---6606750740.pdfIn PDF document text
    • http://elma1.ru/!upload/files/xigodexufadupefilozaj.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522023201450930.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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 17932 bytes
SHA-256: 7fc5cfd8cb2c56a4d17d9d6e6bae2d83ac8edb6c4e609071340488d7869a46bf
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 11008 bytes
SHA-256: 7d1184d8648fa82b0b2b933dcfdf54c2fc721c8cda511841178c417eaaf4a9d3