Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6372ac265d61a6…

MALICIOUS

PDF

88.9 KB Created: 2021-07-20 10:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c0dcfd25a8dedb1021fb5320596f41e SHA-1: f8d957b345d85582a50ce7d31ef7f3cbbff0b614 SHA-256: 4e6372ac265d61a6aad125bc05b23678e07272d7e57c70254aa945a54100161a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. These links likely serve as a lure to trick users into downloading a secondary payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alsultantrading.ae/userfiles/files/reguwexibawuk.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a773ec25f---89048786334.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfc50e31b---43732219150.pdfIn PDF document text
    • https://33mobility.net/uploads/files/sobutaxakoxagakobajaliw.pdfIn PDF document text
    • https://alohasafaris.com/files/15252754621.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/lapuparusokes.pdfIn PDF document text
    • http://amandamaitland.com/images/file/dobimetufiwapu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/53947810009.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea17a0d16---pexegajukufasoxa.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e358897a37---wipadi.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/20911785598.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fkr9f199eu9oo7783v23erlpp0/42037674801.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/40849141692.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/oeodq4f2kjh4c2ogdshtqiejg0/xabosixidupivila.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/pixigujibopedafixuxama.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/83340494359.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086aff6d1f1f---59590727993.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/372849535ad939a7949fae0a17f1d9b7/jugeru.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceef1b2c89e---35910789441.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/kupizovavew.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317acc3187---sibabikirojuvop.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/38467119956.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a46836dc6e7601b4f8fb28740d407e14/67799183081.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/libunajavozizevo.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/74188423817.pdfIn PDF document text
    • https://bursac.net/userfiles/file/zimakexobidirupawogowewok.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/65841878973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reducing+video+file+sizePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 10564 bytes
SHA-256: edaf35d13ff60a788cb6ba18bb9f1a1d75560c966e0cbb8958726e191c7b38ce
font_01_sfnt_off00011042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 17472 bytes
SHA-256: 865902b952d397f711e9d269f216ca5b971c06483e0579528cc05842ceb84e46
font_02_sfnt_off00013e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1