Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3a8faa41784df0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 06:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0a72ed53630e36a46d2bbeffc3be407 SHA-1: d0b5eb52f5e7ae5e119f3552fdafdd39e5201372 SHA-256: 1a3a8faa41784df0ec1844c3cf02ff7ebf84f86e9578d4a5a44958494125a05e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous compromised websites and disposable hosting, with one URL specifically targeting search terms related to diabetic neuropathy treatment. The primary function appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=neuropathie+diab%C3%A9tique+traitement+pdf PDF link annotation
    • http://tabouligrill.com/ckfinder/userfiles/files/dobakebebika.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c4930374c6c---wusovilaxivokogobaxa.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/6sfjjckefo9oqt1gepfjph1kc4/sazujamewofoxi.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/89602118241.pdfIn PDF document text
    • http://orlickachata.cz/files/files/55021794114.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091779e3b24b---xaloloxinotipizig.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/8218659244.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/doniwe.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a760e6000a8---22512293468.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c8ad50d9704bd689926013ad92ab108c/69568299856.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/ritepapilukot.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ebdf95d0072851e776aae898aa467d48/votuwogojuguwij.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01fcecdc2---6266185180.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/bixozax.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/zogobojiwadudiwareduxe.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/14947314203.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/xuvarulapapalonizew.pdfIn PDF document text
    • http://dsagco.com/Upload/file/46557034944.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e21245eeb---66380659520.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bf416124d829e422678e82374af987c9/10701235465.pdfIn PDF document text
    • http://foodchemsino.com/d/files/nuzagep.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/pagebiti.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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 19388 bytes
SHA-256: b21f0ff8d0f6e2f080766b02badb3b819955e4d7585191a74c5423b905b55617
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 11064 bytes
SHA-256: 1fd83d8a2e6ee1cb04e5784e1ccd837c6833b5def2b43e90a63955b22bbeffac