Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ff69f105024c6b…

MALICIOUS

PDF

82.5 KB Created: 2021-07-22 15:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f20cab3638057587e71aa4e1d4eadc07 SHA-1: 9c893779195a8ecc770b8d06db61bdace65d66b7 SHA-256: d7ff69f105024c6b0680cad8398edf0e5532ecf3f4de21dd0b1853696bcb406d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/gmvn3te93h2epmgb1ksjog3ah6/xelijamiweloxaminapovab.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f90451da---84729482486.pdf
    • http://guowangcable.com/d/files/wejibuwe.pdf
    • http://atthaya.com/file_media/file_image/file/panolomagunepuxusemi.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0ae9b0ec5f3cdb8c1450249d3781480e/nerewukutemiwov.pdf
    • http://mynigaoe.com/upload/file/20210510020716.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/25479502924.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/d3gqt042malsrqrntcc001aech/durumiku.pdf
    • http://dachastyle.com/userfiles/file/turulovo.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/14907654544.pdf
    • https://betentour.com/sites/default/files/file/bivijekaboduvibonet.pdf
    • http://chataphan.com/file_media/file_image/file/vekatanavufavuwujeguxul.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/938b375da7362beda8917fccfe719ae6/fiwup.pdf
    • https://akita-inu.lv/www/files/files/fojaviludatabeke.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a3e1e0ecf595b41a765a9bd71a87cf57/sitofeg.pdf
    • https://rijst.nu/userfiles/file/40774662913.pdf
    • http://somsit.com/ckfinder/userfiles/files/zakedo.pdf
    • https://saam.vn/images/content/file/68854818953.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e15d6fb0---rurisomesexosotovojewafa.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23a9e269a---76813208897.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6660b3c1---masemikesuzalaribivur.pdf
    • http://ecotrans.vn/upload/userfiles/files/72853111224.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pronouns+worksheet+with+answers
    • 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_off0000e253.bin
8b6999a401069fbfb23fc627ff70b8351457aa45a8506d7b8fddb18eda3fd363
pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 10436 bytes
font_01_sfnt_off0000fa0e.bin
ea44b8c75dba35c924b8be5577e574467c172bab9a41a3861a720ad881caf903
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 16340 bytes
font_02_sfnt_off00012467.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 16792 bytes