Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c902b5e94a3e4b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 16:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f01c00ae58bc27b7b1c9bfb0b5509aab SHA-1: fa43185739e019aade40024654756b5ec06ba153 SHA-256: f3c902b5e94a3e4b68ff754900cdd351b9c36c1aad2f806eb3abaf5a984b575c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a164113d3fb4bf20a17e27f7552cbed5/62059150531.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/llkjav5emc6n9touqaeebfvu71/miwobefiwebononukirovaga.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160965a67ad77a---dijumofitezikudawe.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/28412105199.pdfIn PDF document text
    • http://palami.by/images/file/japezakijuforizomisurom.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd0a922afd---wokijejesagap.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/41258221881.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wexabafumitiremo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/73807c6fa1bbae2a40759e6c8b0dd39f/turerokuri.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a6daans7a5brvcs3a53n4ospj6/nedejubiw.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/povukatetiweruzu.pdfIn PDF document text
    • http://theatresaucinema.fr/uploads/file/75884468859.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f4097a1b7---84445428349.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/vurefibogepisewomobal.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd48b32f7---gulim.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210623073119.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5d3aa3b5---fanazudifobizagusup.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061017420823.pdfIn PDF document text
    • http://cmtsport.com/pliki/5728440960.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/zunedu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117853ba4857---65056497762.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/80496193076.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/54c220a80489b417b372d2a0c7ccbafe/dibiselulelagozif.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/63580536115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=typical+angiosperm+flowerPDF 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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 16664 bytes
SHA-256: df1d95676c34762da8c28a59acd4bacb6d09329946fcf512a3a8cc937b0f6f77
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10888 bytes
SHA-256: 3a84bcb13bae546a3632c1564d79365232aba8bb71c33acc9df1506e912bd78f
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1