Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f16686e04a1ddc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 00:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ea0aaa28b6c2df875a7fd3c802ecf08 SHA-1: 7596136ee428033c95080226cc88cfae22a9055f SHA-256: 55f16686e04a1ddce28b651e22acf4f387c6e085923b77d2101594a2aa9cddac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=responsible+care+codes+pdf PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c750350ec---famemevubu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100680d4b314---16976965266.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8009cdb567bf4655a3b3addda2714e80/85699896910.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f13c70c01---sewig.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/99200898962.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jitonotalumuzalunixa.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/30101581285.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084686416120---sudika.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/l4ir2e87oret8f5pcq6sb2s63k/85144761718.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/jitobazapaka.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/26068550866.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/32643929683.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00641529f---19182746898.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/najoj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537f5c51c9---pepidobudevinezu.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/52861192452.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/pusivalamigimolen.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/31710224567.pdfIn PDF document text
    • http://medi-sen.com/files/files/ragisovavalitijefusolad.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/mikijudawatatigufoguzuli.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/95529024488.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5bfc6a39acb071d807f6246cd711ec62/tumiwedisuneraxobun.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/f18viod20joqkk2oej1dsebvr2/76781681925.pdfIn PDF document text
    • 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_off0000d46a.bin
8c00ae7e090d0598926cf353b228f6b165467f04488d505c83bb5d7c38fefcba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 21264 bytes
font_01_sfnt_off00010aec.bin
29f4348f36f087e6ec6d6a9db23a3dc5e77c49a27cf2bf9a71e8dc5df0827846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 10700 bytes
font_02_sfnt_off00012352.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 16792 bytes

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