Malicious PDF — malware analysis report

Static analysis result for SHA-256 d748f9f73f39ad98…

MALICIOUS

PDF

110.8 KB Created: 2021-07-01 00:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea5f9301af414699f5d843c84f9705c6 SHA-1: afeff8ea8781b82caa5a75ed72bdb98152d8463b SHA-256: d748f9f73f39ad987e2cdddfe84341fab7ee5f07e2c353e00297aedee507f5d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely serve as a distribution mechanism for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c157c761952---zofet.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a283100c48de499e8cfcf5635846e052/68921852732.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/jovodufeguzelirene.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/30581927760.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/fazamugazemapigoriv.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/68bd18b5efc677f49c823e660c8abbd2/9645278330.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c01abdf48789708e0446796b0d19cc5e/xiwijifezi.pdfIn PDF document text
    • http://sivam.pl/files/file/82640666906.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/wiwareviwofukenewemexi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77351ec47---29117852733.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160763cdc24eed---22915291864.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858307674cd---dinuwe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e2b3a1a---5992746114.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/l4c7iurhv5tld3hhebc7in2dn1/wetamosasetazikexegut.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/11985386623.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/vidomofimidamede.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/siramedabap.pdfIn PDF document text
    • https://guijek.com/userfiles/file/mojixixebiluvevixezo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1a479a45---bonefuxuxu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ef39a0ec65c95f9f724b2086b3a916d7/79411279439.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/21155406168.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/wafudelusotibudutiser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cute+lines+to+say+to+your+crushPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 18068 bytes
SHA-256: 42dd7386276814ca20cd9d7e1f7585981e587fadf5e53575d9e68aa06ad446b7
font_01_sfnt_off00014ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFA 17424 bytes
SHA-256: 61b0d5d10694fe2d07bf14b61cb36dc82931bacc4e8a9717960a060ce1ded127
font_02_sfnt_off00017d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19523 10572 bytes
SHA-256: 59643be5e122a5894679cd4363916f341ca730b19c44179f18b44a66b073c5a0

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