Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1cb5858dd87dcc…

MALICIOUS

PDF

95.8 KB Created: 2021-06-30 02:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d9653750ac14792afb6382c21640717 SHA-1: 0339b760eaf6aff4aaca54548b1be5a588fac3d5 SHA-256: ba1cb5858dd87dccf084d2d4b9010726e8e5f04b45a8d032d171b13133d862d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • 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.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0d0878f5---wenir.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6355ab549---zipobegedanepivituzinode.pdf
    • http://jrmhandling.nl/upload/file/pagikenaravajojad.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2bf4af77a---bewerizabogarejonu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c17f9c601c4---sapiramafopozuxij.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607079c5421c3---totokosimuketonopupoz.pdf
    • https://asiajitu.com/contents//files/78316708269.pdf
    • http://pkynfe.net/userfiles/file/49503378498.pdf
    • https://minegociomiweb.com/userfiles/file/latasurunojufeg.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef6d66e18f---61129817468.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fbcfc30946ba893976737aaadc6d71b1/regasosorofujawo.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070829921bb5---61129446616.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/10896547172.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bd5858ad111a5d9f38d91dd7f3cba922/45107689088.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfe6ceb26---35430631259.pdf
    • https://aedwea.com/upload/foto/tawupulalel.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8223fd42---dotezowodinojupisibisep.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b5086f5f---74565626698.pdf
    • https://betenenergy.com/sites/default/files/file/22409379033.pdf
    • https://sonarmusic.hu/up_image/file/xolelawiruparakiganipe.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ae92a881a33b0a6ccdf833b5f6930461/9372267758.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5343bd40947fd109e3e7de60af976b09/mizokizubijila.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9b962dfdf01217cd5368400f1193f0c8/vovifewumotirefexapet.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160845532bd7a8---sozewivududowubaxopitoxos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=career+objective+for+students+examples
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111af.bin
03980410a99c9e25026a6719c71cff248949aae02d7125085eccedf0098a1772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 11352 bytes
font_01_sfnt_off00012c2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 16792 bytes
font_02_sfnt_off0001443d.bin
11501b505bf389cd6f810664542e56cf97ff796583dbd43829c59a77537a7f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1443D 17412 bytes

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