Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e47764a541772c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-26 16:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4df0e8afe230263ed5a841c268de55a4 SHA-1: f361b99f759e1fc1ce471fe24369b2eaa2269d8c SHA-256: a1e47764a541772c32db5109d430d926c7f3a7608b226c084efc8358a5b6c442
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of a security bypass instruction to disable antivirus software indicates a clear intent to facilitate further malicious actions. The numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://asude.istanbul/ck_images/files/8359820024.pdf In PDF document text
    • https://soalmatematik.com/userfiles/file/69938598099.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/xoniwudala.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a9b5347beb0a033d6ace18e3ba8050b1/lasugade.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/759d9a0d9ac83e1abe6ff18864537a2f/sezalazafalebewelefete.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2676643d7---12324042947.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4416e131c---3789393853.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210721_B299ABDA82B146C4.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8d48e64252a249be37aca75027dd2c96/tavegi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/76372620902.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073670486c20---92455659098.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a19b2f4dc13c88a9cccceaaf2295175a/80493138310.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a1755691---pozoderafobe.pdfIn PDF document text
    • http://greenbrier101.com/userimages/lubixejojopaxadapejivunon.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/45317737054.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ecd8237ce---89991784640.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8dd57b5b---55348368687.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/59171391734.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/74749789645.pdfIn PDF document text
    • http://learningkey.org/userfiles/32178450887.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/64401242067.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af818c48b1c---mawinupon.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/43432423742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=why+is+the+link+light+flashing+on+my+arris+modemPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 17024 bytes
SHA-256: 80b942977ad2bccf80bfc5449071acaced8ee1e7aeed1fa1da0ea5b2c8cf10cc
font_02_sfnt_off00013462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13462 11000 bytes
SHA-256: e7a47826dec8581a5e76307801671ba504906fd7445463fc67660c0cb0f5f823

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