Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a2f7975c78bb88…

MALICIOUS

PDF

84.6 KB Created: 2021-08-02 23:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 480ec6177ab7197cfa7691f037f8aed9 SHA-1: 6081ce6e83bd5940f961f45ffb2a6fb03b87264f SHA-256: 18a2f7975c78bb8813480e30f1aafeb3334b6e7bc94eea971d20d7f3f9dec925
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 malware distribution intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users into clicking these links, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=henna+tattoo+stencils+ebay PDF link annotation
    • http://thaoduocquyhiem.com/userfiles/image/file/89672687154.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/budukarexifajim.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/93938315653.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f1c613a9---67317083498.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c1dd65e3---12652463087.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/biribovijobudukuzagav.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/tatesefep.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16268683516596.pdfIn PDF document text
    • https://jurad.eu/files/file/zofijewasesibasogo.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tozidivige.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab25a34f8b6---kakalebebogesafepej.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/qlm0rf0e38mn4914cvkm208aij/bilirafobizatelefuwolij.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7568b9ed1---96784654214.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lqvpbr6qq8dvchhbt56vq7dv5q/42450571878.pdfIn PDF document text
    • http://livilgirls.com/files/77044770347.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c30586g9rqgk0rj1dbiiib5fs8/47280117689.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/58278611081.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210608/2106081021323542244mme6uijcg59.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/r3325los4jc4dl4o8fdpmhcev4/loliwoxi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qg90ks9ebikru6hqurv91mijq4/zesiwizenajiw.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c7a249b45c16cc75809d391842a14a44/81460249254.pdfIn PDF document text
    • http://idroter.org/userfiles/files/wutozipulelafeni.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/loganufitimisiz.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/45040297028.pdfIn 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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 10368 bytes
SHA-256: 5815a8619f30b3baa1ad9aa259ae060aec5cd21a94ee5f5a7bf7346160361861
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 17288 bytes
SHA-256: 3454578297ba214729bd4afc1ae1af9ef1e64cc1c4850b8f3338751d3f249b01

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