Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be81532f63c7833…

MALICIOUS

PDF

80.8 KB Created: 2021-06-25 17:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 99f04e0f463821c68aa8480679da911b SHA-1: bace136030792ac41230da94b070206d0ce86bd9 SHA-256: 9be81532f63c78338015436b8ba9211f06afde003b65c8da25c3df204d7e3a51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations hosting other PDF files. Heuristics indicate this is a link farm designed to direct users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/552a33b45de0df066461b42accbbbd61/pujusigatexivosasovagipe.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4bd851939---67659579156.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8fb16aea9ff8b1c49dbfbe6a135c3953/pufij.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160856c981f2d7---13104655033.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6abe3efd---44750759507.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/30560450289.pdfIn PDF document text
    • https://noddy.nu/images/file/xapalagomovosoponovusi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0e844b40---25404523175.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/mexejolevadosudopuware.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc13c340a---kofadegokujuli.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9a945ef0a---78577268664.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/8b751f30d3662d10e5963ae324389c10/novev.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3a78697a0047bf0931ce322e448cd604/rizileni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8ab27b3c4---96803412889.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90e3313d4---6390510321.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9bd701f4cc0089b1ca59d6af79fac39f/31902620766.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160934bc51eaae---14565910527.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/894600d60c3558a5df80f0981d09891c/3323703244.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnm90nm8frmkit76gqe83pkh5g/fesuv.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e3324a15c05b462633c1f92d31f65da6/59161291010.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fcda88f---giwuvekejibora.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/t751hmh3gm7u7h9snjr0gmbveg/55299924809.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/73a8ec050e5a5cb30118e6e77f7670ce/82275469326.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/14608636869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=coc+hacked+version+unlimited+troopsPDF 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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 16668 bytes
SHA-256: bca0c109974745a6ecfa1631cdbc007408235ed1a08e052b8d96bd921578906b
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 11068 bytes
SHA-256: 1afadae850c7fa0418069e18c800e8049e5850dd0e2a1d22be859685fb2b611c
font_02_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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