Malicious PDF — malware analysis report

Static analysis result for SHA-256 159d5a3fba31f189…

MALICIOUS

PDF

96.5 KB Created: 2021-07-01 09:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 424edc77c05ab78b25e62133656ade5b SHA-1: 32e17d88e705c8962b712a6b68d580cc898732ae SHA-256: 159d5a3fba31f18991c38a50e9a3908de70941d5a7db9070ede3ac12fa412113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://allytemp.ru/uplcv?utm_term=electric+field+strength+meaning PDF link annotation
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c20bd6aace6c7957c895681dd55dfc78/vuxadono.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/19035093658.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70bd79474---38217847834.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9b1111aeeb3c22f53fc4b824c6a53f41/pomunifuxojufilo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad4aad55c---87928185528.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xolid.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/temaranizalepujodukukapim.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775ce784d42---goromikesepejadugi.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/32391218316.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ae8d05224ebdfc256f72bd9c56ce601c/dakofazifarewivaverit.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/konutikoj.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/77265341945.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdktk36d7n2504q4d7614pvd3n/63246161194.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc34d6339---60579521223.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/93643064737.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/86675093282.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f2297df0d---dorural.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/007904925c390971c4947e2afdc3e593/jivile.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/71776617973.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11e28dbc5---gubakanopaxokanavalijufa.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/9c3885554ea5c4ce3c7419a36bd3b53b/gowupasovuko.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/836dbbcdd43c45f6a88fc83a172db771/vuwomupixotatov.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fu9alnlig7no9b4nd1pcvo36k1/94089061351.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/92180945917.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 20236 bytes
SHA-256: fda6b6aa72e29c5d771a19daf7444278ae9c6208792acc5beaa0d9a1c5e02959
font_01_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 10784 bytes
SHA-256: bfb37854b83f9ac19538b02a781f2343cdeda1d593374fb3e2fafcdd17d469e6
font_02_sfnt_off000146de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DE 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_03_sfnt_off00015c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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