Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae984b38fcfd429…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 20:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dec6976c064d6eeab934cbba093e64ab SHA-1: bc8c5c018499ef4108c731f3b49955d4a73dfe73 SHA-256: 5ae984b38fcfd4297b98f6330fae405006bbb4e17e013810f7f9e0ece5bf4305
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and the use of UTM parameters indicate a coordinated effort to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cj7922hsphvgd7tc2oc0v6ldse/11476438678.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e41910822bb---15180152254.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/93jvq98tv59memidc59g6vkaec/97080448973.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45e172ec71---kawugabilurezixomefudoze.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a5b8e36b---kagosetodalikumoma.pdfIn PDF document text
    • https://polandpools.com/contents/files/4806322571.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/tugadisobelinagapanifud.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_145513.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a41137854a0---radetobekibosixofe.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/53592453695.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/mgddie4ke12adgm4u8mcko7rll/famomekisiwujelosipiwefe.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/revojerobogipitip.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec73b0f3e---jetonizafubifenoduval.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b165ddce---73520159153.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/tofefexojoxutomukazeva.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/4ekunschvt63jkhqcco07hqhmi/13453282438.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2da429f6---vodupixemiwumowofizutixop.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/42047636190.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/80791108319.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2236bd26---78853796926.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/64026452650.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/nujifufuxiwawumesar.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160efeaede8c22---munidexuja.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sesuvupevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=colorblind+lil+xanPDF 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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 17472 bytes
SHA-256: a786ebb561a01d7d145bbeec92cadd3d41fae7fa64d23843899a9cdeb0793587
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 10116 bytes
SHA-256: 95ebc4365a9b6dc138e5b60fe78a53b3cc82bfb3bbb03c81e853f66ce4821648
font_02_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1