Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d3f1f94305bdd1…

MALICIOUS

PDF

93.7 KB Created: 2021-06-27 02:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4154b2e11efe4c2dc217bf43292bda27 SHA-1: 020d182cb24de826024ebb9847e911efedfac1c2 SHA-256: c6d3f1f94305bdd16d6a6be8c0a084e342684519939fa953a1dd2542628c6841
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 domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://computer-rudolstadt.de/upload/file/juremugezanudaxanikude.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607515595c498---37928928389.pdf
    • http://sakuragiramenandsushi.com/uploads/files/2573312230.pdf
    • http://andrelandberg.com/userfiles/file/99283153962.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacdd67012---22669090720.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b963501b652---84908606524.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e7466dbb52ec1a58927cf61b322eb15f/xezuwejikageveno.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/43991534219.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/282b0ae4e4385cc8c7986f89a0e3299b/bewetogedu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/00bjsa2hh9q2l2162jhqrlp4o2/rojemozajupinojivotiwe.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609293b42b188---40215254795.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tbdv7j1rsfgrdbg5p4ncjnfgk0/85737496385.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2cedf990---xugagowi.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07697288d2---pegurokogajikedazu.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/ledegozezatusu.pdf
    • https://angkorphotographyguide.com/userfiles/file/surika.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb51b6ab---73191505632.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cad8ac4db98---26312024790.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/39960655624.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee85436b03---36690101379.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0ede80caedabc8ee72941ed25d52e9c6/19015929893.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bddd5747c74---nisetilavetuzo.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3f298d68df392e8a33aeca1f520f2f35/takijapovazodiperijik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cone+dystrophy+erg
    • 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_off00010c6c.bin
132b8668f32722d52188e048475b5dd2cd5375fe7db74a925259ea7bd48fb257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 10516 bytes
font_01_sfnt_off00012424.bin
179d93fd8a7c4506725d3b9c26c36daad942d0198a50837825e91eaf34bc1cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 17724 bytes
font_02_sfnt_off0001517e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1517E 16792 bytes

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