Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a10e6f1bae00ba1…

MALICIOUS

PDF

84.7 KB Created: 2021-07-12 22:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 340668773b0fd113a43b310e6e0a5f8c SHA-1: 48c5662ae9690ecb5023b273e25f2943c4d4715e SHA-256: 4a10e6f1bae00ba1a37c5724321c4326ad8d87e621e50cd33ba743e9ac8994d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbfcd43534---munujitefonakubixatalu.pdf
    • http://rszm88.com/upfolder/e/files/20210604210017.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/16924537359.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070366d3cb42---pitikarigub.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673e8e521---28615631124.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094d97b9d7a1---nogasi.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/gasugowe.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a876c4dfd---kewizeviwowu.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//82683601946.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adaea64e2e0---rumadimixomifuz.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l0f45aahqv6vm0dr3qc5sm8803/16877538339.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160949bdb1994a---mululejep.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/29f42c48ecb7da4d4622ec35807d5a85/sogenimuberawetepofejep.pdf
    • http://afghansolar.com/userfiles/file/tetojuxomamulamabuwula.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e73501ebc78166c80c22d2b2482f51b4/88237901051.pdf
    • http://www.urbanwaterways.info/files/20517007374.pdf
    • https://musikkursus.dk/userfiles/file/69450384204.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/n96f463hmiomp8cecbocqbop9e/molufizitaranunomonad.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d6087000a7d---93457237346.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ufc0fiflfck2odmkk7f5fb9ue7/41033123707.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/36c801e69b14a34433f71fe9831b347c/kilopami.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c077c1957---jewuzibizorur.pdf
    • http://marleenjansen.nl/images/uploadfiles/94697581549.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e549a79b03320f3c355540753b4f955f/dopedine.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tome+of+beasts+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_off0000e847.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 16792 bytes
font_01_sfnt_off0001005e.bin
97ff9f4ee936adddb8666438c0d7328107b758f29fcd1030f63ed196b658a0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 10420 bytes
font_02_sfnt_off000117d1.bin
0f6d9c7499bacdc3a22ea5047aa7fe1924263e4cecffeccd7b2debcdfdcdc3fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 17380 bytes