Malicious PDF — malware analysis report

Static analysis result for SHA-256 6376bd4a84301d46…

MALICIOUS

PDF

71.0 KB Created: 2021-09-03 11:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb0466d7708b3e4276c8c6ab06933c03 SHA-1: e43505b2b662751900c2b8979076f2f221f2c707 SHA-256: 6376bd4a84301d46388791f39c9170f5356acb0c845cbed7ee09c564db1b96c9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS upload directories. The embedded URLs, while some are benign, also include links to suspicious PDF files hosted on various domains, suggesting a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f197a6ddb9a---7719087793.pdf In PDF document text
    • https://33mobility.net/uploads/files/radanexunogaxewaj.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/imf7505okr9vgj2ieo47tdj3a5/7534166650.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/pigisofafufaxu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/cf54t89a154cgsaeiq7jkr9tht/dinosoredifidimo.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/depugokuliwalo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb44d00b---31291391688.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8154e8b4a---28145834408.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6818df882a8129236cd2d468f863cc38/94459799636.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a04ba45ddd---87153480564.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/sasonelo.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wuzaxelu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeae90fd30---16923983074.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/47722293721.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b7dfe8ab36c2f4b6f1de0c8bd30d1944/92445992934.pdfIn PDF document text
    • http://jar-ted.pl/file/sojifukibo.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/97564689287.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a19ebefbc4d9a397386d683a4a7ec6f5/24948455165.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05694b9a0---48552956773.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/birexoravijopigusonere.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/051852404448.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/3313231581.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/4897066001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ravi+p+tiwari+reasoning+book+pdf+free+downloadPDF 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_off0000b565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 11104 bytes
SHA-256: 1a2bd79e72aaad0427cc0fc13efc1a3d0c2c81c5b181a6bf622074715ded5c78
font_02_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 15552 bytes
SHA-256: 340644277923db792ea6d92615405bde1faa7fae4b47489f8b44a6f41870f997