Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef348dcfd7f343b3…

MALICIOUS

PDF

86.8 KB Created: 2021-08-10 08:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df6e9b62efbc419ad87af5b61319536 SHA-1: e516d67b5408cf406f210d0c76afd0332d5f6f1d SHA-256: ef348dcfd7f343b374ddf5c1c4952f5c43b2da1343ad76a9aa2dc515295b3ed0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing to multiple websites, some of which are hosted on compromised CMS upload directories. The primary function appears to be redirecting users to potentially malicious content or phishing sites, rather than executing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://magendans.com/imagefiles/file/tipawepiza.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e2785395---5837003518.pdf
    • http://asbazainville.org/userfiles/file/noluferolawukukobasux.pdf
    • https://mariellatriolo.it/public/file/29652941764.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cd899675---9644509587.pdf
    • http://alliance-ltd.com/userfiles/kiremaxonil.pdf
    • http://realfootball.gr/userfiles/file/fuxuzo.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n5tefmimdbhgjini0lq7fenvs4/34514913213.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4d1189aa0---rusenuvosexazuvitiver.pdf
    • http://mini-garden.ru/userfiles/file/giguwiwozukatoso.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/34108903663.pdf
    • https://svetplus.com/userfiles/files/77790307133.pdf
    • http://ghalemdi.com/userfiles/file/koxafisulogakejeruxi.pdf
    • http://alibabashipping.com/userfiles/file/xakafev.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3813e349c21895b1d44c03460e59d860/gimegububuk.pdf
    • http://sakem.org/userfiles/files/61861103466.pdf
    • https://chaletsuenodesol.de/files/77889833412.pdf
    • https://dermatologie-francophone.com/userfiles/file/fofimajosogarar.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/cdb72ceb8c74430b62ce251ac6b08e7b/foxegimuvanowomogixapi.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/56521739867.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd86601932---56586762691.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=d-link+dns-320l+custom+firmware
    • 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_off0000eaeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
font_01_sfnt_off000102fd.bin
7b67fd52d852ad1ff63973374d0d39515036be36222b2e2b6b41423f35b63087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 17748 bytes
font_02_sfnt_off000131fb.bin
0a274c648b6d24bba753f6d7859bbfd40d19f26022cb7fdd3bcb0fd80b2584cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 11364 bytes

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