Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86c7a8e19428573…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 22:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc59d9f2a71e7517013627fb092aa633 SHA-1: 5812fb5784e9836c79aa42b1a45a774976190269 SHA-256: d86c7a8e19428573836a189f7fd8781db0f7d77ac174dc7108934db2111be1b1
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains numerous embedded URLs pointing to various domains, including compromised CMS uploads and disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=should+soft+drinks+be+banned+from+schools+essay PDF link annotation
    • http://seanmore.com/userData/board/file/dujugurezidul.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/rikafe.pdfIn PDF document text
    • http://foodchemsino.com/d/files/37883172494.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/96127433421.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/toxusafakevobetek.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/11109912382.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/58012376286.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb821996c9---78932833561.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/47276622245.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607346653a400---16558947375.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/08dff24b5d6c5709674143daebbfca45/medumekaguwesunutize.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/15809558438.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/40400430419.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/981908521.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f4e1c53a3d534e7dbf2b378a7f251a1b/62683851832.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/wabokonaturomisuw.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/purez.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/41298541005.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u88liu0b0v0p6fg4alcgamj457/zamufibu.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/xoguvagubipe.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/78889738284.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4f1j0ab894p3b4usvor679684v/45989237304.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/derikeb.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_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 17200 bytes
SHA-256: 12a0dfb9bcfb22ac5eea51e368e93345128eb25c0ed7be25f8c074a078d9a02c
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 11260 bytes
SHA-256: 1d9afc03a8f35c738596ea3b75e341d6276630cede513177aafc6972b772e17e

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