Malicious PDF — malware analysis report

Static analysis result for SHA-256 441372e9bac0d024…

MALICIOUS

PDF

92.1 KB Created: 2021-08-31 05:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5375bfbc2e97ab1a633ef897a87210b5 SHA-1: d964c14520c2598ef9899000d2744ece2fb79f62 SHA-256: 441372e9bac0d024f3a49ba93fa830ad1e9790c2a69ea2c6b0bf434caff9600d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to potentially compromised WordPress upload directories or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://conblocmanado.com/pics/file/85295452294.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d063a91d256---rumufu.pdfIn PDF document text
    • http://cartopack.be/Images/file/84862183926.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/xarutuxetobifalodoxif.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/wupuvupodumedutobebu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160713dfa50c7c---zasemubexomixagetaramo.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/lopefinugopegewewemex.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbb3fa67cc7976006ae34e0b4ab30e06/88543715866.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d5e477cb---babofow.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/gisugogalewuvopirumotif.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/6883590654.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/66730379363.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/63087356081.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d61c99608---mipezunarusisopaw.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/kakewavogokikos.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/ruragome.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/60732339670.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c548e944d---2130868031.pdfIn PDF document text
    • http://asfalon.com/__files/file/kazadoduzurezimezexogum.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/le18pul42t1m5bv2od4qv69khp/kerazepebawawepudovazokij.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb958da395---kaveboburulelixivipubumus.pdfIn PDF document text
    • http://bdn10.cz/files/file/bafawujozexananu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/buvirorexomoladuvi.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/japikefafetizor.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/40461826948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=short+motto+for+sbhPDF 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_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 18848 bytes
SHA-256: 3a12f4c99efd15f2e0264534adb01ee048d4b81e92e316dbad0d17aa0ce346c1
font_01_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 10156 bytes
SHA-256: c199db2dede71dc112ff753a1f9cda3de9d7fb9b6bdff9607cbabc08db893acb
font_02_sfnt_off000149a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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