Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9558a3dc62144b…

MALICIOUS

PDF

86.5 KB Created: 2021-07-23 06:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c476fd5e54abab57adba0552df58f38b SHA-1: 7d53793e9a4d618992aacfc4d85a8e76a429240e SHA-256: ff9558a3dc62144bf235a5a3b969f13e484ad8ad23065b4a025e5bb7df5a3904
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm suggests it is designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9jgcckaugftu2pmkc9mahp5ks4/larepolerozobutavekiwib.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/76775137041.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8a9a59eec---91035568959.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/budes.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802d13923a5---doderajibevokanafu.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/31839948230.pdfIn PDF document text
    • http://hotechike.com/files/files/80088867322.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/8178578761.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/wozafuge.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/3828593839.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/31599988290.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b35a885d2---88035634274.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hgupj75e4q9ht2pcq5lteu5btq/fumulelogijolenikuzu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/54731086867.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b261ff6f6c242458ba3f6f4c86e1c43e/35234647057.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vadubuwodokopejarozus.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/1855381376.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad37d485e---33370925615.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed3cedbb2---korinusilexirozaxu.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/60406405158.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/082ecc478ea6df290419cf4c5f933be8/ginunivenalifilopef.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbfecbdf9---ripev.pdfIn PDF document text
    • https://bataretak.com/img/files/file/baxitisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=down+towards+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 10632 bytes
SHA-256: 3b1b16132dbffd77fb7be062f8dd0811fac84c1337d0b8261c3ddb24e32bd9b8
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16064 bytes
SHA-256: 574d955721a9022cd8fe8d93a4ac41db508cda4c697849f0a86fa975ae70e4f7
font_02_sfnt_off000133a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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