Malicious PDF — malware analysis report

Static analysis result for SHA-256 16583bbe98f2dbd3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 06:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9a353a0f3c379563a627fcc9f2fb6ce SHA-1: 866289e9d3d2dd4364d7fc2d89a6d3c31a37aa8f SHA-256: 16583bbe98f2dbd33bcb8d0d4094daa97a45afdc803dc2e45a4c77a8b36842ce
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=pain+at+base+of+achilles+tendon', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=pain+at+base+of+achilles+tendon PDF link annotation
    • http://jikaramen.com/uploads/files/25719356799.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/58651986314.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210706081219_25cb8.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/zagekevoludod.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/rogek.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68499254878.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609041b54ce04---lofenomeme.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/mexuvijegibopuparipefigu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608045142c80e---70748152228.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/23f1837b747fa61d1972a96c7d5694a8/37769846620.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021080309162273499.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/korabomifefavemowajixagu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160accb701cd58---98631843538.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b28462db8af---togonajikos.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/leluzuvimavijefaranoju.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612552c3100b4---4599673950.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/4654652419.pdfIn PDF document text
    • http://prosquash.by/data/fusupibur.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/pujuvutebolerelofasumemu.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/76604280960.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f15cdee0---50238672074.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/32530620555.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/71306066297.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/82348465607.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_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 18164 bytes
SHA-256: ec1f60675360b3d8dd7146d7cc840c1ac684f61e92e5cfc92a72c30264e4f652
font_02_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 10616 bytes
SHA-256: 8ae57fa80ed39bc3133369be63f715f53b5b28fce23362abbe8eacc1e593cd12

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