Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3c1cfb0f9b4b05…

MALICIOUS

PDF

89.3 KB Created: 2021-08-17 08:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2738c558acd79fd6c098e0952d189487 SHA-1: 0ef5630fbe7f1ebfa65e5f1758b354da6c82844f SHA-256: 8c3c1cfb0f9b4b05a2f7ba34df9ffaba4e586ce897d6b31a2ba30d40565df747
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/961e9f28b0e3243d5260d0976a1518c0/latevujaxitiw.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce9ba3fc9e---84751636.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/wetovokamavidiloz.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fusizipimegupidil.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/polama.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/49912794187.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/43971536887.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/281724a341e46c8ef253ae24b5b63aa5/lusoladudojulalexo.pdfIn PDF document text
    • https://biocoils.com/img/file/nujapesew.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c26303e3c---26428120474.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/cc0a7425f86c48394bb4db1f2e264903/wedekalipugofubog.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/tarasoleponorapi.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/lujomozetukotatogunej.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/babimenelibixoxukabu.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/kujawitalepoxaxovoronutip.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tobarupunerovidipiguz.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j1krqjq7h0626rtiq75qdtoev7/pigabupojuv.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/bovibupexomujedumobiwel.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1c6da9dc798a9074d998714c9a25c413/rugamaxusedomobexasumop.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7abd90a0937d83a1f3fc2dabc4079de/89466048658.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec3bc5870---kateweferuwilezonij.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/7260806301.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/bnjlujr5j4at5hoaca3nq99odc/gawapavekixevabalinasixe.pdfIn PDF document text
    • http://naviway.su/upload/files/mudezemalima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=are+nespresso+pods+the+same+size+as+tassimoPDF 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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 10652 bytes
SHA-256: 30e77603243b02ba8a645c2e37d674d89588cb12f068e53b3c4c997fffb646c3
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 18484 bytes
SHA-256: 332b76bc362cdd641d1fcee67937886181d8dc589b3a1af5b5ff227b11e5a552
font_02_sfnt_off00013c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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