Malicious PDF — malware analysis report

Static analysis result for SHA-256 618bf68dcc6e9c38…

MALICIOUS

PDF

79.5 KB Created: 2021-06-29 01:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c4b6393b8b8622f490e7768eb96b8d0 SHA-1: 429f189a4811d1f1df6c4f823813f994afa68459 SHA-256: 618bf68dcc6e9c38a319fb758bea08a9d2e37846d0f38b18171c06da4ebd6b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to obscure the ultimate malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0ll2o7j19g61brt2qldpe6vgvn/musujetilufuderinafi.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aff1b8e00a938b80b98517f54625399a/mumemagijeleroso.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0d540f196bf8d636dbc933bfa24f0398/35025397938.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/62435295201.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wogizijexotikumekud.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c80597c8d550ec8156ac920b8b033538/gizuto.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/pirukufafogorodewawazo.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a7f4e2eb---xasurabaduzufox.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/49114673944.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/satujowejixewavikavuxe.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d307203301c---31607969041.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/35630758113.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fa956a5264c4cc0d09c10b95df578cc0/95386185185.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7b260eppt6dlho4ieafd7a2hv4/defavorixilijobezoge.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/07fb9aae359f0c5acb73aa2e457f9a90/99564155808.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/59406903106.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/25156235105.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/66554861294.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608057b822b68---tuzesiraxibobaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7ee8dc9e---72292433039.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/dd6fd00ce48eda20c0ac55edd4d7bd2c/gekisogarubabonudotarerud.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/jakotuvubavekepejunuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=specific+heat+capacity+of+air+at+different+temperaturesPDF 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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 11128 bytes
SHA-256: 75bf34e5669efd25bccf3465772c7df9fecd0bc43c21d8b3f48731f6886ab5b0
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 17284 bytes
SHA-256: 39e062df3f325dba76ebcd1252522684a0fd6e44d518c732364359da2f3deabc
font_02_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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