Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e0452b72344314…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 16:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af257a007b1580eb825a793c7d6bda0a SHA-1: 9d07ae7a31888521a744083597cc1875d697ac17 SHA-256: 19e0452b72344314ef313ca2e65ee389288e44f49f5c087203c93095f9f26690
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDFs hosted on compromised CMS upload directories. These linked PDFs are likely designed to phish users or deliver further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a6a79656---zetafisepefabigomepunow.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/d4tbqjmr0dukggvbug5l7g09ds/92739863692.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/akgppr91k32k8hrn4t47p4q1qv/35057920992.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/49412394005.pdfIn PDF document text
    • http://toonesk.com/upload/tudizevekurunopulaxozo.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/sigejovitigoraludit.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b3646082---xuguwi.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a49e59184d424b4feed5406b8807d477/fonogilefi.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/tinakhue4p1b24pvgp705t3dn1/19919813606.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/32239471638.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63271b704d---70525551709.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512035727548641.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/72267656675.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40d0b70c2a---55650418236.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/guduvoripitabixivomejo.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/lekuze.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/76181409423.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baede047218---rumevareguwodev.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2eb9600933125904e87795fe382a96f3/91832304776.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2462c4c96c79670dd279b839e8c9badb/54059373892.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/n7365gbsvb5a6a8rblnvit1j9v/43146763835.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/lopuwid.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b51c0a121---70547532891.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/18509577305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=directional+references+anatomyPDF 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_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 10612 bytes
SHA-256: a73b16811736e7a6d4e5dcc82754ad97761bf1ed9d9d67c11e6baa0b690b1978
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 18124 bytes
SHA-256: b09896ad2a7c11afa52609227596a2def64ce58673a74e54e903a5a52ebc9839

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