Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c81000ac909c82…

MALICIOUS

PDF

85.2 KB Created: 2021-07-20 04:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c1aae5da8ca3d5ec590bfc3910ba9dc SHA-1: 17e929e713cb8433bd2407a5850b5879778fd3d1 SHA-256: b8c81000ac909c828a8713598ea3123a2216f69ee5c8b6d2f2586f8540ff36db
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and utilizing form-builder plugins for file uploads. This structure strongly suggests a link farm designed to redirect users to malicious content, consistent with phishing or malware distribution campaigns. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328267f3dd---xutoj.pdf In PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/vekerezexizuj.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ufhcet2je9g2vkp507edei2j46/liguzofisufinajukajerixe.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bq25803e8jihocrel0foup9j3a/gewejolabevapeb.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/raweduw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160847c0dbe44e---37163454266.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d86a870a---juvodupovamekeluzos.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa7c0ef4b---37875251034.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/zalaluwodozakojekarakema.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/robokunipanepilevemigede.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16083a92532b5b---88170344680.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/jotaferofurixaw.pdfIn PDF document text
    • https://auto826.com/uploads/files/91805892602.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5652fdc7aa48fc91765d907f143d2579/zovibonafodididutabefoga.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0ec61e2288954de203a541e627dd462f/11724023684.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/1002167210.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/44adb6d2029e85879705772b479d17a2/sanegonulurem.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086205c4e594---3782413837.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/86097975618.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/xegipakiduxuxiwuviva.pdfIn PDF document text
    • http://charivne.info/images/file/mejoditi.pdfIn PDF document text
    • https://udruga-invalida.hr/files/53744932889.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4e8884a304958ee33775b88f41886e2b/93009723862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=four+stages+of+alcoholismPDF 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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 10756 bytes
SHA-256: f01c330e3f1c5f89da1d42ed0cddab44b61765c91fd45694146a0f693d036e92
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 16172 bytes
SHA-256: 96cda62fa737a690a588b86f98ac816a244327e790d21992952474e452119d89

Open this report in the interactive analyzer, or submit your own file for analysis.