Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af6dea78eb33f6a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 05:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c16b2b9e948980b08ce15c4168caea3f SHA-1: 291c03c255b4380dcbba79face73fb9b1622d974 SHA-256: 5af6dea78eb33f6a8ee549a3100ccb01cc20d4269506fa029c86034759fac8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the nature of the links indicate an attempt to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2095ec30b8---85601239916.pdf In PDF document text
    • http://anipetkingdom.com/webroot/img/files/xuweduvugag.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/28547096174.pdfIn PDF document text
    • https://educhina.mn/editor/files/pemurolerozov.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a03f51dd8---lapapavisumivalowomiwoli.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/75cc05b28019eb0f1aad8f812bdc9cb8/zedusagosedoj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a49ce21fce34ba01678cce434fd7c25f/fovonotelonizanebonurub.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a51a4b89d---gimitofagimulusemisenagag.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/wixafuvanevopagi.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pf8umbeaedqh3b9g9eoh3v38ju/56114148982.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/73090393785.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/sixekugiw.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161196ce3ef70a---92736484279.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972a8c9e6c4---69695769368.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/69342264481.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/26879970083.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bo5aus6f9jtju3l0bm21b7mbca/lafomowidesalinujitelib.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/c4ml3r1nb2n2sck30qr78378s7/fuxoxadufolilaromudopefib.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/67096384879.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c57c6e0477e2d899aae92ba197bf62c0/radibukow.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5d1bdbc3---18510767440.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/xizigekutajijato.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/17374641764.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c132d7b24b7---makokog.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/taduviwegufoxapuwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=temple+of+the+king+tab+pdfPDF 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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 17788 bytes
SHA-256: 6a7a32fef66b9c18801abe38598728d18bea9eb187c82f7c4013c20eca0bd4d7
font_02_sfnt_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 10872 bytes
SHA-256: d9461e90092a329ce276e730fb9462148b34da004a69baf4554e8fb371ac589f