Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91a21b23402b2dd…

MALICIOUS

PDF

91.5 KB Created: 2021-08-04 00:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82118a149ad3f342fda224b2fbe950f6 SHA-1: 11e4ee00606a72d832e9cf03ff00e45d27ebc1a4 SHA-256: e91a21b23402b2ddba7fa07360135dad866a05435e1f3211c79041db8c6ec362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://cungcapluonech.com/upload/files/80218534785.pdf In PDF document text
    • http://studiodebiaggi.eu/userfiles/files/zumole.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab7d56d0849e4f425400db1e2f606890/ziwamogegibab.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pejapinuxoxozaxolejan.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78e49ed5ab---lemomi.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5056014229.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be794b43718---14928027808.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5ea5fd758457b0d4444c02873d25755a/73262761543.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/17125632149.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/15651076892.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a819f2a86392cb83a6fc2c36e25c0206/bokakenarotot.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/83928734653.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c504ca45fe657006bd6bcf17bdc90743/24971226671.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/xusobazikelidunapivigop.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6507c30bb2d3022ac60483a04921d2f3/19176373131.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05188cf06a---velepepaso.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/30135268311.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad4b3be7b---dokawulukuratanazirijowuw.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/37274608149.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/nidobexitita.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16084df33eab35---78052050493.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db8cc5775d2---36096877135.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4ac3a814---rasujurivijopirurojumig.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/25127115193.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c215d2d1b---69615452110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isos+xbox+clasico+por+megaPDF 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_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 17724 bytes
SHA-256: c39f546325e97597d31a8415ac58511c3f28e9bf24906b964c614739afd07ddb
font_01_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 10708 bytes
SHA-256: 2ecec6e65c06aaf7fb88e12bc8d9508dc4deb35f0b34993184bad1afbe8b05be
font_02_sfnt_off00014593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1