Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abfd6f5bcadb008…

MALICIOUS

PDF

90.0 KB Created: 2021-09-06 09:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f21d535d6eaf32ecb75799e1b4ad4e4f SHA-1: 154e42943f5681d46cf1b963e5dca3eea480e5fd SHA-256: 7abfd6f5bcadb00896a09651c5bfdde931ada90cd44662a972b4521b238f3d31
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to potentially harmful content. The ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

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 http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/mumuniduzil.pdf
    • http://geostudio.eu/userfiles/files/25542807681.pdf
    • http://apexnepaltravel.com/userfiles/file/peputemexamibidoni.pdf
    • https://cokhivietuc.com/img-vietuc/files/rufekolemavuluzito.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6db08dd8e---xumafaj.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca709d973a---vibekefanabigejad.pdf
    • http://aarogyamedico.com/userfiles/file/bevaregonevademuzo.pdf
    • http://e-sheremet.com/img/42825763386.pdf
    • http://cherryontop.pl/upload/fotki/file/loberabulovuwabagagifigak.pdf
    • http://jinshi66.com/uploadfiles/files/diropipimoni.pdf
    • https://prospr.fr/ckfinder/userfiles/files/vetugamavopajutesod.pdf
    • https://kermanrooz.com/img/files/96975858796.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/tagotigizuwobunitisa.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c56a6aa3b0---98231539063.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5037dbfab40904b24bb4ff535eed4d2f/36427049068.pdf
    • http://bularz-auto.pl/images/userfiles/file/59447169446.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cbea5665ed5---59688745189.pdf
    • http://indianspringhomes.net/userfiles/files/jevebekexulani.pdf
    • http://calhi1974.com/clients/46234/File/62093849100.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/sagavetoxefujaxi.pdf
    • http://elitacasa.it/images/file/1788245665.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jc10b34ol68ssgc2naid0qebh1/25320972397.pdf
    • https://loctra.net/userfiles/file/98072811801.pdf
    • http://eastcity.hu/ufiles/file/73474445102.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=4+factors+of+production+pdf
    • 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_off0000fa7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 16792 bytes
font_01_sfnt_off0001128d.bin
7e9297faa824f3c6679b7565bea6f863d18a1ba9070de8e900a529b8e00fd28b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 18428 bytes
font_02_sfnt_off00014232.bin
55048f1dbb434a0348177c7364e7ec44bd119a213759a2a1f765e90a67ae6622
pdf-font-stream PDF embedded font (sfnt) at offset 0x14232 10516 bytes