Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f7441361505a3a…

MALICIOUS

PDF

100.8 KB Created: 2021-08-26 14:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4214a7d184b629e66c2c1df0db228f05 SHA-1: b2c46acbbb310f07fec7c106c81548a64d3fc411 SHA-256: b9f7441361505a3aa33ac16dd409032783cc61869be19928f62ae31e430def6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URIs pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa74e809eab---zuzofunutas.pdf In PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/bemomaluzi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v01gg3fln1acvhaohprmgld4bg/kazupabokogeri.pdfIn PDF document text
    • http://suaups.net/userfiles/file/muroxewavarojexakexivepug.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98cb5b9128---rejajivu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/betodagikozika.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7ca8fa26816d65c6624be2fee2e04438/gipupuwilarojonenesewub.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/2406172819.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e944ea3207f1741287decc6705894a1a/pakokagorarikulikijemog.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/bazulunawujapaza.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2fadd4bc9108c60fef0eb33eda369d5/67748957558.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/tatatalizabimoxewogeme.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4566d44dc3---lidadawolovumavoxa.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0b4313df0917915a23a4597d08a70d2b/82133321113.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9epk2e8o5cl38rqndvs7v1ci83/viregafekaparisijobejuwa.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/86960281265.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ad2ab98ed2b57e6bcc1a6f7cb25f7f33/95523639210.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nujukebefajatilaxobil.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a69cb5769---jireza.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/babasiwegadowuvux.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080c16373a47---17065387382.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74862cdefb---lojubudiruruzemawufazav.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/5211681880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=windows+xp+download+iso+32+bit+with+crack+full+versionPDF 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_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B4 11588 bytes
SHA-256: f94e13b8756f1151362ff540f8600be56d82b3c7d8af1ec746889766728e6695
font_02_sfnt_off00015315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15315 18056 bytes
SHA-256: b7f75f6052a0793d8acaf2e12cc9a7b02afdc713c32ee6d7a03546e5b4a43a6a

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