Malicious PDF — malware analysis report

Static analysis result for SHA-256 422b1ef491e61bed…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 04:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75be930d0736f998d7cc11813d383514 SHA-1: 260e93d43e87f8c9cc5a942e29e904e87256e8b5 SHA-256: 422b1ef491e61beda2ecf82b61f8e4813127cc44e64e5a6a99020d5df73a94bb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to numerous disposable hosting domains, a common tactic for distributing malware or conducting phishing campaigns. The presence of multiple compromised CMS upload links further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://didopack.com/files/33006792060.pdf In PDF document text
    • http://ipceurope.com/assets/file/73792934881.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/17340423900.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8558e6cd2---rofiralujovadumuwuloja.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/35037113439.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/10462085050.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea8c09988---43600224246.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7d4d0ce96a4f5050bb08d4c1e07b91e/gobuwagono.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/24235754650.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f82b9ba3---15981378356.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f928fe2cf9f---musojubuxuwa.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/76fb09cb7f15cae2a57c4f3acc6e777e/14147748350.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/runuwefapepiritugeno.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/48494020411.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de90e34575---59377384831.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18323b856---14080958431.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/88380764836.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6262a7771---sefolowo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/6uogkvfeonn1jomkt38bfiv0gl/bizetotuzewakavogug.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/79484053739.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/65965520933.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/73395344054.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609448354a6c7---38085585309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bodyguard+380+manual+safetyPDF 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_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 19436 bytes
SHA-256: e7d031d94a39d15e2889b135577669b606894ca0621c16e5609022179fa0826c
font_02_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 11376 bytes
SHA-256: fbc55776ad5de54185b84814ec6c5369bebbb27c5eac09431793d75ad53cdd71

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