Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5698224642b0ca…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 12:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b64b45da826c8e6e20fb77daac84b7b SHA-1: 52e6dfa0d636560276083747d37ebf0b889f0550 SHA-256: bf5698224642b0caefef138ce472bd4839f2b37ec5c967f9aafa1715e592d2b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://geoplan.su/userfiles/file/geweja.pdf In PDF document text
    • http://studiolorenzoni.eu/userfiles/files/zareramizevu.pdfIn PDF document text
    • https://aneri12.eu/res/file/9058868534.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613751a6762c5---vikimili.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/71369359362.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ddb01f3c---55440749894.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/25548905765.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210907_115712.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/18969594863.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/gunebaromokerazo.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/dulagubemusuvevajomefu.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/17549908666.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/bosowe.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/45368056742.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/6111411482.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/7891817832.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/91bffafd7ed626012b1ad8b7c302998a/92203171300.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9668da1e604f8f9a83a2fa1ae67f3722/97872484481.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/22289536396.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85259788973.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0aef9708b---guwexuvafumotapejebififul.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/obo9f4ctj4jdjc6k6its6t1s24/38899391414.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/31862247155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=doorbeen+full+moviePDF 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_off0000ae8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 15212 bytes
SHA-256: 31d8b8e0b36d6f5123342850cc913800a67647d91d2afb31153b98b133679f03
font_02_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10256 bytes
SHA-256: c91f0b107bc0de91fe0660fa36b7bb19ad52d45c339dc593e2725c510b7903de