Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9181e8483056db…

MALICIOUS

PDF

103.3 KB Created: 2021-08-18 22:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff9ebffaaf92d45afb1b01c3f389d6ec SHA-1: a0dabf9258db06d59538ded581877d3b9b8f4227 SHA-256: 5f9181e8483056db430aa35ecfc6c184a05223fa6192d76ca559c08df25ea9a7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many external URIs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=best+free+vpn+for+ios+pubg PDF link annotation
    • https://aviseco.ro/userfiles/file/3810834709.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/vaxibalejoluwevamilixaso.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/rexorugalasikobagidiliki.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddaba13daa---35803778532.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6babb90cf1---mopawegovenerogibis.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adc42ce92cb---gerubewijegusenabajomenij.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/44648874352.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/95294127034.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/47988675465.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/11282159928.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bdc9e9f4---47578492326.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9521e7dc83---45748931148.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c07c758548942c6e2f63aea47d49a3e4/pufinapaxotokisaxozu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bn6eo97venjr5hq5bvql0dlg4f/vokora.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vmdoid0r50lpupa4kvl7fbac4h/gixafimu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607501e64b295---lalifiw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611aeae005741---valus.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609294965bc8e---87848817521.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/44921412791.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b10062944f0988639daa06c41b828050/nafoxozatumomomagi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7p1574pi7tl6b685lmpl1c9gds/54493586385.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cc1a3a90d229cebf4cfd92f8a6f7d8ea/xukonuxuvedewemare.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d24147df1dd---70876067998.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/22594e4d5a2b28ae27a924893bbb855c/kuxixotimebepa.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/jogifozifasajidikebi.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_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 10684 bytes
SHA-256: 5a3aa1a9df5fccfd9f251d4d94bb34f26c49b118142d7fe18f9d00bfd785922f
font_01_sfnt_off00014a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16221 16860 bytes
SHA-256: a0f045d5852af542d2ededb2e6f3492586564733fcc74853b2fb867703b43eff

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