Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e591360fe5f8414…

MALICIOUS

PDF

87.9 KB Created: 2021-08-14 11:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7cb364379816258f0fc6d2bce413f6eb SHA-1: e69b215cb5af2d5d96c62fb6998446e43919c790 SHA-256: 1e591360fe5f841484345b739e15b80a8468f84f39fdb42f3c96fe5efe317432
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an "enable content/editing" lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://nomylo.ru/uplcv?utm_term=how+to+make+monthly+report+in+excel PDF link annotation
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/80583db3c42ba710de15ce435be83fa8/watuwagefepetam.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/474493185097bfa4bce3bc6cc2f728c5/10833011467.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501150148741964.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/dororekelumup.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/482c2589c4a25800b5280026b7047141/kaxawokulutifaxujofadilu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b90ec0c7d---25151422876.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/a9519fea25d110c61101155f4f1ef651/jobexitifupibaxeruzibug.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zodimuxexojemelij.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/82807628719.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7dde4b75---9810350284.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fizazu.pdfIn PDF document text
    • https://senhewood.com/d/files/rovenitibozapowodunuf.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073146d8b98f---xapobipofirotumenojulujo.pdfIn PDF document text
    • https://redac.ch/upload/litagapofid.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/97644129833.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82709b496ce557ed7bf2ecd53d4d3cef/pubafixipote.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bdbe949d---siwiradesoj.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/likaxenaj.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4885a2d73c---61466614396.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/pasunokapadatado.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847c43b8dfe---27443697527.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0318ae5dee2b6d1f853e3b30d0507c6a/96189706020.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/duhf1l10ql5eocemhn76dd0h75/tigolaxigab.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/rutukuvuzalijaw.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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 17100 bytes
SHA-256: 5e21f7ff86a798dc01383d99d65b2e9908977ff1e942fab4a4fec771fc24a9b3
font_01_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10856 bytes
SHA-256: 14aedc70c95a7d2bac1efbefb98e131ad9bafe0a84ead3b952599b6592696caa
font_02_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1