Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc775ab88b9615d…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 634b30607998ad6c5c83182b3e460fec SHA-1: 3564beda75c8ce63ecc1b55c2f2b91210ac80ef9 SHA-256: 3cc775ab88b9615d8e806aef8110a9f977e7a1f0bf11f8a218968a53aea6f99b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://cructi.ru/uplcv?utm_term=where+should+we+go+right+now
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/l9augsm2o9u1dvc4n3gkp597d5/6899420421.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8bbb16be---vumivevikopisomilojot.pdf
    • https://sogelec-eng.com/files/ckfinder/files/wupejinaweratolog.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/96011789023.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a6b853d6711968e2ebf131f8c69651d6/gigebetewirap.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a71956a2---49358228910.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c8838d57401685fa9d93d9e5b65f7d2d/zagutunojepameture.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878191ad303---nilov.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/372eb6781048ad4623a49446b3b83482/nupitabeva.pdf
    • http://kirakuramenandsushi.com/uploads/files/41825876795.pdf
    • http://ugrctrani.it/userfiles/files/totegimes.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1909fe49d63593408b8123151ec8f633/6919113223.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/36530829944.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8969a95c0759105d5bb92e5501e70fe7/60310068639.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cf6558a1---44028603243.pdf
    • https://vipbeachhouse.com/uploads/editor/file/55295836683.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b1bf89252.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/edc136251fe18b73a98170266c1c62a1/falujavimoxakigobogoj.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079958458b67---37504762401.pdf
    • http://wabasnb.com/files/fckeditor/file/119448234160aad829dab6e.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedbeb412fa---48746308356.pdf
    • http://liburnia.pl/userfiles/file/zuxuxi.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf18164c09---39127389683.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/dubenepakodan.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
font_00_sfnt_off00010f92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 16792 bytes
font_01_sfnt_off000127a4.bin
5623f34a69f0cd0df26da7befcf687bbca5c328bc8306fb7b9603de94a9179cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 17864 bytes
font_02_sfnt_off00015653.bin
b6e85f52a372c86f7c95f90e5234845afeb13cd0f8b14001c1e81087f56eec26
pdf-font-stream PDF embedded font (sfnt) at offset 0x15653 10544 bytes