Malicious PDF — malware analysis report

Static analysis result for SHA-256 425fc585f33301a6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 00:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd3fc9dc5089833508b6564ea16138fe SHA-1: 0696157811fe95463ecec53fac60c8c68063b060 SHA-256: 425fc585f33301a625babd92861e99f0c7fba29df485b3a4b3e4bfa71aebab96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of JavaScript (T1059.007) and the overall nature of the links point towards a phishing attempt via attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=super+fancy+pants+adventure+apk PDF link annotation
    • https://office-agglo-larochelle.fr/userfiles/file/ralijigeb.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/64299004044.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/46086968766.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/73916857603.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/kedugomom.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ug3hns79cbni2cucc6tf0egs1v/jubinurabukubefezuruv.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/ginawaxamaratito.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/47833691414.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/76186068323.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/70743047559.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/kuponuzom.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/kubotivipuminatodapofet.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/gebovabewiziwomaver.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25705308819.pdfIn PDF document text
    • https://felicityokolo.com/file/bozalesazu.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/libomifug.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/77819905036.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109011621308918.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/tepajuvobilikovenof.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b9603033---puwegejagakogexafexezi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4j9ejussn16j2pps8ka6prhj17/vubudugawedavesunul.pdfIn PDF document text
    • http://isvpro.com/custom/files/66514488420.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/nesabonan.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/61817563434.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/80481925381.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 10800 bytes
SHA-256: 428814d57338ed95488b6db0d2ee4f93ca375ef8f2efd4c116a2b024048e833f
font_01_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 21752 bytes
SHA-256: e3356b365af7c9b95bf921d26e8fc8193e4eff95134da01c4263713992e796c9
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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