Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cd9f268e193ab0…

MALICIOUS

PDF

74.7 KB Created: 2021-06-29 06:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00cdaa85dd3c23859195da4be5ba5162 SHA-1: 0a024a37d60c62a4f93435bf6c8183f4687a73f0 SHA-256: 43cd9f268e193ab01704a702bc3ecbb697a966cc1d4618781755a5826166d9dd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution document. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or to phish for credentials. No scripts were extracted, but the structure and URL patterns suggest an attempt to exploit user trust through a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f645874ca---lajifuvid.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb418c7784---pezekajoziwad.pdf
    • http://plncse.hu/php_data/file/16699754932.pdf
    • http://www.cerathai.com/image/upload/File/sigidizano.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o20998ohnj9gsirvp0kv1al6l3/45717734560.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/7021140700.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/tuminakonob.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/jexabal.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e5a3326b---rudaguneru.pdf
    • http://arunimaflavours.com/userfiles/file/32245421025.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8ac7b2d9f5192ab969eaa845eae58659/27174880108.pdf
    • https://ewt.cz/res/file/bezirefeb.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bbd8bd10417c0791c5566c7da338cd58/11950106956.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-28/20210628033502953986.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/rorujuzogarefagaluzu.pdf
    • http://marcobernini.it/userfiles/files/kewijonawomubovosajef.pdf
    • http://eltonltd.ru/sites/default/files/uploads/22784282447.pdf
    • http://armanetti.com/images/51163800987.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc37360a89---misaxox.pdf
    • https://menlopark.com/wysiwygfiles/file/44700247273.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc6272c03---8311178829.pdf
    • http://sugarfree-gelato.com/upload/file/vipevigotajaserepobebotu.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/jozefixiduboxewav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ieo+class+2+previous+year+papers
    • 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_off0000c2f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 16792 bytes
font_01_sfnt_off0000db0b.bin
8aa39184f222d247b941781b234c431e840661b85fc5d670ffd6eae6315deac1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 16360 bytes
font_02_sfnt_off00010578.bin
6df5d95398276bc87eb81dc6c8eaf7a36a901d52e63cb0e85cc1d34f40dd8885
pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10516 bytes