Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf0c3d4ac0585df…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 09:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dc3f138315d715b3755eee9a0ad7913b SHA-1: ca205a200cff6d148ec2725b2ce1b078d78a8ccb SHA-256: ddf0c3d4ac0585df7dcabcceb2e380657d08ca05ac17bfa0236df6fd0ac8c6e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests compromised WordPress sites are being used to host some of the linked PDFs. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=i+lost+my+icloud+account PDF link annotation
    • http://dekobonner.de/userfiles/file/41064824964.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/94248509029.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/15684765182.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pedoreganokuvupukosu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/ritigom.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6a471de1---nepadalegeviwux.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_94CE6E7AE18B8F93.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/dovonisedab.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/perapodanexez.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/jakevetekez.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/85694484930.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vidironemawe.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/35303518553.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e82464bfba---gesazusedabopozunopev.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/95215564901.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/59955516436.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/33029708694.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/33566999644.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qel9uvi0t6i17kj1fs72fpbf48/losejuwarozog.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/41069028806.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/riluwa.pdfIn PDF document text
    • https://atlantidegattico.it/file/jotanewakejum.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/sazasunotomalelo.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 10464 bytes
SHA-256: b3081af700e22a6deb1ea9cf4e7a988d408f93ace037158160d8365b5728314a
font_01_sfnt_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 17384 bytes
SHA-256: 94612fdd5e59e2c91c1aa8882eb46c254089f38f9eec7d595393b9817def62a6

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