Malicious PDF — malware analysis report

Static analysis result for SHA-256 1621f730ff87e2b9…

MALICIOUS

PDF

92.8 KB Created: 2021-09-04 02:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ae36ffb98826ea0c1a823babcbeab76 SHA-1: 70248aba8ab30f7b9de6dda0c4ffe37606ff0788 SHA-256: 1621f730ff87e2b976175c002425070716fa550baa8705fcc973f6af5f139759
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised WordPress upload directories and other domains, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through potentially deceptive content or drive-by downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b445fdf06ff---56828980089.pdf In PDF document text
    • https://agermag.ro/mm/file/diwowogogimaworowuzame.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608883b81105a---27387702022.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/zupebetafaxamave.pdfIn PDF document text
    • https://wsbtitan.com/images/file/679066043.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/25349154201.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/dororitam.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097c01a831d5---78572328716.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/25154965913.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/95386392915.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/41190408051.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/puxurexevitetawufam.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/87107978708.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0shj8i7nnbos1h6nvtep2vme3/vijaselomabipuz.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/noxeliduvonobegefadotafo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfba21273---wexebirubo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6700e2e3e---45057419133.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8pe65bhtnrs3ajggp9ao43e7am/78686351180.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f2148911---bosasobano.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630705b813---88403251058.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/xilovu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8baa56350b0645ed6aebba00ed45b507/salevexubupunafukonekuxu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4cda2e91---95317045657.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/5071005163.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/74141627780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hyundai+tucson+2011+manual+transmissionPDF 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_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10896 bytes
SHA-256: 2317cffc4fc36cebcbcd705239a8b8fedb469e076fe9361d5d8149ad1152e56f
font_01_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 17920 bytes
SHA-256: ac94400a9810a1e8ca607fa448dfd36eef74aac2abda39b4452ff34b220b2c8c

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