Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d5ad4083051bd0…

MALICIOUS

PDF

244.7 KB Created: 2021-06-30 00:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8938e0f1b089dba6aafc9a89da1f9968 SHA-1: 24717314d2fe7824094a144d261f2256821c5966 SHA-256: 41d5ad4083051bd0d7ea20c0e78e9035669d8cd0e9627a33c9b14ed722e3f8e3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and link farms pointing to compromised WordPress sites, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload. The embedded URLs and compromised CMS upload links are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9456

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=list+of+chinese+dynasties PDF link annotation
    • http://schokobrunnen.com/idata/vevavibusekelabateve.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b0762f5d95260c6602b033cca652e24c/vogunune.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q1p04t96s7maq1t7011llojke3/nenel.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dn6iar6epkg58iti1kgc8trqub/69731086510.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vunawoverexasopakim.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/018ee3ada88e847e9b8285d28fcde549/dajorekawufibi.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/91458849587.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5f3cca3c7c943aece574b9887545c105/52775748751.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5225cac7---6269461504.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/kelipuvofaxije.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607996548e37f---36175906706.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/42748850817.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2cf586b9ae2edb49a5f9b79260ed0241/86220382175.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3f7eb604---nokipiteratig.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/fipubamelaxi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/bigurizegiko.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bf83ff0cd9f052bb3112d5a21fd33873/38807885240.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/38712392847.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/809b723f67a8417c74e8122a2858d3a0/jojisexilag.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/46518924293.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/92c1f6cdd6a773ec49a6d7b7e64fd22a/54516015838.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba1f8c7b26---misowir.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2898c226b9---fojifibujekew.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3776555e37---86626770665.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002633d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2633D 21968 bytes
SHA-256: 7863765d9b663f37b929f5af772128a6a13a6cec4aed7e93191ebf125a70fa9c
font_02_sfnt_off000297e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x297E4 10496 bytes
SHA-256: 82e85eec8b6e37bd5a1f7ff8de5f3d0797819e7007df4fb0b30db5df9eae6a19
font_03_sfnt_off0002afbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AFBD 110260 bytes
SHA-256: fd4c725cf4593b4b7e2663bb0577ed124bf25b79f3cea491834441831211a2d2