Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5aded7805c671e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 17:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1ad46f4df0fbcfc33fe4c5466e88610 SHA-1: 41811c977802dfe956b6b691d203d16edaf45b43 SHA-256: ba5aded7805c671e681ca44cbacbba189c1fb3f635072ece1b8dba7c73b01bc1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to various domains, some of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hunicorn.hu/userfiles/file/vixufajijusokives.pdf In PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/kabonar.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/17539482611.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/15445708627.pdfIn PDF document text
    • https://websbag.com/uploads/files/befokakasok.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/61565747708.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/fakakigexezovumotafozix.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/54298681261.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/91467411514.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/divolivibabadurifas.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pqp5upobb95hknv3qrdk6nbf60/kurijededulozow.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/39463772824.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/faxabipuper.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/98553497660.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326e1cf08d1---45873497702.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/nufavotezokizikexo.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gusiluputa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3ff735ea---96590620149.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/79147920040.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/83003017780.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b541ef32b---7896599363.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/21559797499.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613962baef0fc---41916992830.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/tikugivozufedapubifaxil.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jewuxetusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vanna+hotel+migoriPDF 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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10356 bytes
SHA-256: ef39da1a6feeb8bc277d11bbb7e70283d3b7e247f9d470514c2f6eecf31621a4
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 20188 bytes
SHA-256: c75d53a3d0e9233a80c03ab340774b3c4ecd99d8f1e26627f502d6fbaaddfad2

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