Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9da34112c7d948…

MALICIOUS

PDF

81.2 KB Created: 2021-07-23 01:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ca7f7285d511b0661231a8cb54597777 SHA-1: 452c350cf76ac66f12772e65c0f96baa86f751d4 SHA-256: bd9da34112c7d94817be3581ce248f9f35981baa5e6f4730ade881437dfd6979
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing to multiple compromised WordPress sites, indicating an attempt to lure users to malicious content. The presence of numerous external URIs and the 'link farm' heuristics strongly suggest this document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/f16ad8465bdb237675ba430477dc077d/pemeperukudamivuvube.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/aa0351fbdb1d2dc83e940e37d8e14488/61800293733.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c8894666f---kemugijarosugu.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zibidaramugevakadigi.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/jetozixuzatuka.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390375559c---85980225221.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/65b45bdd5652994765122304855a2813/rilalowotukafesupubukinil.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/rosewumolimasigot.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gad1qof8qp5jrtt2qe79rmama5/59063118148.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e77d56cf---dupobalujo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/vewasizepuxidixewu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag2cn2jgdbi9lo1fbr3cs01nv2/vazisasurojelokera.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/barika.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/94d7a767ec62196370b99be3f10a7036/68615923538.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/38948676533.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6348c89542---70972359063.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tds2ink4tpdit6okeodhejee13/28658406516.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4bc193f9---pusoziverivuzipetilef.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4jq7q0v3sk4chsln5o58i9fbqe/55344847521.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ac90bc5d---67642922539.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/186a49885fef4dbcdf349b11e6879ab8/kofaliwinabax.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606caff6203cd---romewurabiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=entry+level+attorneyPDF 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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 17364 bytes
SHA-256: 19e30cab8ef9a89658fe71f2d57230f09f69e3b46f55cd9d4b9e92c1eecfddac
font_02_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 10004 bytes
SHA-256: 7767dafa6555658c2ac9892a2553e5341c17bc3e713a019bd93dcf35c3ec933a

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