Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb6b5171f37eb91…

MALICIOUS

PDF

101.3 KB Created: 2021-07-08 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 580f73cb1a818cac469ef0a0cf61b300 SHA-1: ccf6dd455f7809fa69bdea8ff9668382ccea9a91 SHA-256: 2bb6b5171f37eb91da71decb82e3ca142dc0d528f68b7f926e3c20bbd71beb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and other disposable hosting. The PDF contains numerous embedded URLs, many of which are unknown or point to potentially malicious domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stop-remont.ru/ckfinder/userfiles/files/81681913159.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b3d86249ae8cebbffce51a6a8fdaae39/pisav.pdf
    • http://houselandia.ru/files/lilasimobuboxatat.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2ca631521f6450ff65f71bf62854b59c/mubofa.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aced9d3c2d---japaj.pdf
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/madavukoriselidibubom.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070962346422---94899041332.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e876381c2---64391074837.pdf
    • http://ufnk.fr/app/webroot/files/file/79864439759.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab77ee295b6---37271621402.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f4a27b2b---8914709927.pdf
    • https://np21bellapalermoshopping.it/file/2400600614.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-7-4/20210704033137514531.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nbreh158s81ul70s4jedorgblq/63491160932.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f6ca7c45d77ab5632e637d203d833cc6/dujukofifevofaw.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c289f637eed---gikofoga.pdf
    • https://watertorens.nl/userfiles/file/woxonarafunu.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75cb240523---sepavosimoteboketegemiz.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d35fccecf---63770212029.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c14ffc3de2d6801ce371907e9c0e1ed5/72984085889.pdf
    • https://hpsoft.shop/upload/files/kapibevizavoxutiruzud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=but+i+love+you+i+do+oldies
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2275798cd56810d06b779603ce27c052/86579876811.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_off00012a3c.bin
5b445c530e7dea3078bcb4f2cbd26789019576a68ab63fccfce5b16ee19b7202
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 17932 bytes
font_01_sfnt_off00015953.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15953 16792 bytes
font_02_sfnt_off0001716a.bin
220ab3c58e714169c04f67ae8195b2b16a841e123bc42595656d547158d7b36b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1716A 10208 bytes