Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f59982d91ef0926…

MALICIOUS

PDF

121.9 KB Created: 2021-06-29 07:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9ae2fbe2a7c67cf5aeec92b9a1ce216 SHA-1: 8bbddf48850aa52e9d0c95dfbb11b60a5692a98a SHA-256: 3f59982d91ef0926e469af4bb7abb481a93fac0032e64e010fce329a32fc13e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the presence of numerous links to potentially malicious content suggests a phishing or content-distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608262ca2da15---segigo.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/6mk06oblotvci16mi55pf2h42u/90648267353.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4419297e---vowupafivebipomizej.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7ac112304aaa572a8fa62ccbdc7990ff/38579719189.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd5f576eb---petuw.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe2383e551---zuxufibapup.pdf
    • http://kaies.cn/upfiles/file/51090105806.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489e056f1e---23113046071.pdf
    • http://libertyquad72.fr/userfiles/file/jajakasagufipidovonefewob.pdf
    • https://synodradomski.pl/userfiles/file/93324879230.pdf
    • http://provia-events.de/pics/fotos/1/file/torub.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c1b1f76d80b82a0d20be2fe7299d7f0f/35310805713.pdf
    • http://olgapolyakova.com/files/files/semusoxukirirebop.pdf
    • http://tpdw.pl/userfiles/file/febadegabelitusi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9419f4c3---zomenakarulize.pdf
    • http://dreamcatcherltd.com/userfiles/file/meputabosifogawuxe.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2d336f8e0b16524d55b58a1b79d57ee6/sodatupifutavarozeginudev.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/s6k4nomdj7dhjrch3eu6srpd30/4172278839.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fd742c5d4550f5bee954c7e809927e1d/dutipenoduzowerapoja.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/of0dvugn7uv855o9q1d31866k5/nigokawuridivewimaxadud.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5c7234266e2b4a3dfa241018b072e3a4/datejubepelawomu.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75140b51b0---24389800205.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/59641375171.pdf
    • https://scavilecis.it/userfiles/file/67616555186.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=motherly+love+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ccc.bin
3d4fca193c7183242efb66dd6514a23cd3196c5920f05da79601050776956f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 10560 bytes
font_01_sfnt_off000174b8.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174B8 16392 bytes
font_02_sfnt_off00018adc.bin
0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADC 1668 bytes
font_03_sfnt_off000192cc.bin
05571c515fbb67c04a1bd956dc98c30eae84e4a0298d221063becc8cb5838828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192CC 17144 bytes
font_04_sfnt_off0001bf75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF75 16792 bytes

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