Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4aba1ea807eaf…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 02:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c99ff56fea5c774d8e2a9cccc54ce8a SHA-1: e8646df82ed0f119b8f69a536426d827ae85738c SHA-256: 43a4aba1ea807eafbd2fc9eca3838be2cf2c018cdd1f9fe711bdcdfa892f4b93
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://juhaszautovill.hu/userfiles/file/gapetudowaxerapozaxi.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/61945681659.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4d83f241d10d225961898090345b36d6/gikefenuzipawurinap.pdf
    • https://damiel.eu/userfiles/file/42816965715.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/xakixoxelidamamemosabi.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7ef4ce35---51320983382.pdf
    • https://ayurvedaemart.com/uploads/file/67539984781.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7241feffc687c85bb11c29b20743af6b/12628142849.pdf
    • https://akproauto.com/nbloom/fckuploads/file/tebut.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a4c96855---73525756553.pdf
    • http://sujitonweb.com/userfiles/files/vamipadepebisukefofovelut.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c9cd3fe8---tuvax.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1dc5c001---jojarazevetenojodedaluva.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a80d6a4f---89919346161.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/38696106554.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f75433239---wetuluvewimekosupedo.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750bf88e14---26455656394.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607232e4c370c---46008060308.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f1bc5a9e---pojirewub.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dbf89cefa---kuwuvukijidodevevogu.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5aec56027bfedc10d09097d9dc61d9d4/33457300726.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/de03ac71856c3e555fb895bf23b19630/kewizotebazunatozajas.pdf
    • http://www.rpv-drachten.nl/files/file/20269061953.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/85f0c7b58fedb6c0bb15850b29941c27/64798554405.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=250+mph+to+kmh
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/83b31b04c1c24d4875a5cba63e7f66ec/42581512391.pdf
    • 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
stream_003_off0000fa92.bin
28a8f1086e491830f8b94094cd57bf5048165f99f0ddfd6e4586fd9345f4e6a9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA92 25660 bytes
font_00_sfnt_off0000e417.bin
f0c9e735ed43a82d33787906a52c37dd8a9cd5bb7060a4773f26f3d77d6110ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10084 bytes
font_02_sfnt_off000130cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 16792 bytes

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