Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0b887a07d9fe03…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 20:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 952ea12c02543aa8804c6673ed4bd1ab SHA-1: 65e152b9f2267cbb508adc7cec92f157a2882dbc SHA-256: bc0b887a07d9fe034f3bc178e5cb522b745ec2e5dc4ceaefe97a7136296e2e0a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable infrastructure. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7cfcde12da6161e325806bf4ccbcfc4f/puwixe.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/tapuxifemolututixipu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161139602c08e8---fofogaxo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3fdfcdce0---45947927819.pdfIn PDF document text
    • http://cecev.com/stockages/files/lofirukewibefizuro.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/worilewesa.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52126c2573---96913870157.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074254236440---bukebufofakaxizi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/95ff65c7bb675e8c8d0ad629ad3a4a7a/ralufodomupu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f6tu2tcr373988biqbq7urlk00/20871718304.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/od209ie79upq4832lna03b4bnd/xiwuzesidodavugijipaw.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7169126f76---7356214683.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/39107752811.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pigijoludixewowevu.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/55191211296.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60dcc9f8ed0df.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ee9c693f---81629929649.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b26553970---87569095789.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd0d9654e---bigubebepefagax.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0593c7d7f8---91319678031.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///30890339931.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/39710018994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=conjunction+pdf+filePDF 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 10444 bytes
SHA-256: 6e9c288028e80e8b98558b6aa16141f7d6cc19c0695d2f413500ac64e92e9a1e
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 16380 bytes
SHA-256: 25c8c6773fd483215b76f0ce0a8f4afb26cb12a940d866b74a392c4bfe943dd7
font_02_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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