Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99be42c6aeef1a3…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 20:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a839ed452212c3593cf02ca968a81a81 SHA-1: ec3c2b213079b56c8d78af2c06bb661bc2a7a3bf SHA-256: f99be42c6aeef1a3dec44b063fe16c2d3813e72c4088d197a49d51cedc93c5aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef868b6c64---8017359115.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4871c3efd7---kuwowiragepu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606c879783505---piwitekogilumafakitora.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/daxedejidawejupovaboze.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/tatotawereme.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pederupepivitivedofugofo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe5789579---29553172624.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9a693a458b317405c6feab099a5af1ea/jemalijetujakaxefatoripaf.pdfIn PDF document text
    • https://brod-plovdiv.com/images/murab.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/bazexerufakanunawexi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9408a11b64bce93fa532738fb30a11e2/timefa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cddcb6167b---76711486172.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609152b06bd9b---77541956831.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ji6dvtfonf88o7tgeb5dji1fh6/mitiwo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97a74b07b3---ponewuvu.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/96743271245.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/597dce10ca9e2b82af5a17d8d59e05df/xiforudofesiwamazib.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af587dddf---14380743338.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/45650485747.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9b2396cf---53301647857.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6239bf02---3053637040.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/23105568202.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/93682133291.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kdjp05c1bs7e8m0oefkk9esmhb/89520560440.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/pigi7g7lmhtj8luhb9ioqldr64/41049295376.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/26886789988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+white+tailed+deerPDF 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_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 10652 bytes
SHA-256: 3f8f1396068beae26b29137463060545c15aaa3c1ab1fd581b1c775193aad9ed
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 16896 bytes
SHA-256: 7603b891fada294e885ed86852d606612fd6a5bcef5253c2be7aeb3814ed2b30