Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c73c9f248c4faf…

MALICIOUS

PDF

91.7 KB Created: 2021-06-29 12:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e43c310869b3396aaa6fbbca16ff9cf SHA-1: 34218ef2b271e79bd9a2a488db142ab7890a72aa SHA-256: 19c73c9f248c4faf76d03c1b14d22e839783fe5614e861792fd722a0d0449c0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites, and ClamAV detected it as a phishing trojan. The embedded URLs suggest a pattern of hosting malicious PDFs on compromised web servers, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b6d59141---sepowemikaji.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1a9fa45lim3o70aonqlecf3l6n/44999491562.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/779ca18a4e5e540ccdde7ba6d84ff588/69903827452.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/stb7qqqq3rrqebiigm81g26bju/vopekixez.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/23rr7e4v7nu135sj5a0ndrqqer/tavez.pdf
    • http://fedoro.ru/upload/file/97244900406.pdf
    • http://shannonlakeestates.org/fck_images/file/80066220607.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/melopatidikifijavuxolajo.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160924d6160a58---siputigixukusutedilipi.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42daa3a0d---74528383619.pdf
    • http://voxel-avocats.fr/uploads/file/85827831692.pdf
    • http://www.amedna.com/userfiles/files/47867676220.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c17a1cdec---72759959190.pdf
    • https://chungcungoaigiao.net/uploads/files/58122474406.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fb456b4309b01afadfd3f08da0b64e89/vuriwolak.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s5ldmj8er9gp0cuftumfpvcdck/pofovijuzaxixegi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097633b01de8---86231346511.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/46ff660f6a288e0b5e32755c2054a144/sodopobamexeradaxosi.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/584facce8524fd8bbfc09272c7b861e1/19590736488.pdf
    • https://aplusadvance.com/naver_editor/data/file/gefabeterexewifapijub.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdab206db7---60021261262.pdf
    • http://terralindahigh1981.com/clients/866868/File/xuxutalivevupesipowa.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8336248fd6e4c07c839d5231aaf1f18c/figuretedokedel.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f432589cd815e6b70ecbd8cc028dfea3/rebopuzunalotevamivupiku.pdf
    • http://bigxra.com/uploadfile/file/2021050906373973499.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e2111999892d72cbd45c6af58bdaa554/6437878928.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=challenges+for+game+designers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 16792 bytes
font_01_sfnt_off000119a4.bin
3013060db82697031f4c96fce8f01ff1bedd2532851a7266c187530dc6c0734f
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 10736 bytes
font_02_sfnt_off000131db.bin
73623d4bfab08c308cebb7e43c4ad62c0aec1a45bf67fad61845dc567ffde042
pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 17992 bytes