Malicious PDF — malware analysis report

Static analysis result for SHA-256 842ac79c0a5b6b21…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 18:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a96b583d526f720e97064a78331665a7 SHA-1: a1fbd46326b39523d282f627d695c79b4094a0e7 SHA-256: 842ac79c0a5b6b216e059df8f87495700cfd67b2137031e215880f91ee6f6ade
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=the+seven+stages+of+life PDF link annotation
    • http://bulk-supplies.com/userfiles/file/10059733731.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f69217a2e1---60611567275.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2ccdba71f6f83f015633fe44f8c25fdf/36362027751.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/87277615168.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/tenewafusum.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/3254763233.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93dd17405---busejelev.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/67808761725.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/56514049800.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/zibinurodozevujijonix.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/83284851973.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b761f889---83916242149.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/4287606905.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/46169449210.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/tobuz.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/63962925416.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/zezojololejufex.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8c5dcc1b5f07c7a5bf49c64f5d6cbe4/godulekidodefa.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/65823503077.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b53e0a8f72d11c2a7e50059d0258db1/zorokupajefojotudavota.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/dotazigatifofobepiwawa.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/wesulivekaj.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109151029315260.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/85560708632.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/dawizexe.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/94110155026.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 17484 bytes
SHA-256: c710913ae9dcb3ba684d7af7e516b564d3487777a0bebfa25347fcb50bd481da
font_01_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 10420 bytes
SHA-256: a1b12e8b71d9a4a06883df40f6d079e0aa44f3ce04e1b8a0ff8961d5ebe7efa7
font_02_sfnt_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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