Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbacfc5b499b0fe4…

MALICIOUS

PDF

88.5 KB Created: 2021-07-08 03:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d46ae19077642c02d597e46eb8c8defa SHA-1: e82b659c4ec747fea603c9f433a1e17cb4d282e7 SHA-256: dbacfc5b499b0fe4fed2273aca2a082edc16d85f35e61de0625628c4389faa6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the links point towards an attempt to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://laborke.ru/uplcv?utm_term=need+for+speed+most+wanted+2012+download+windows+10 PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/32cc4596f0b1d44c0bb8b1b3437fa050/kuronejutapokatesuvukiw.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/662b4ee0c1c0cd30e1d0d8fbc0c8a173/jatigivuronuzenofa.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/55446636284.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jebedikoxakosimagekopitu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2e76f6c841679cd02c53e60a08451235/16265832086.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4d8d7de93579dcdf2085eaf4935d1489/31032936974.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/81363010310.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d266523e97f---82115066472.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3585d6292---60453634692.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d88ca3ab---76887743629.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/51235d2ea5e8c9090a6c8bbc093ad096/4901149211.pdfIn PDF document text
    • https://cecprint.com/images/file/36222089588.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/37040242084.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e788e2927c---tiwasefonozamupuwed.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f077071669213c77a27dd82c37cb4a54/11698963397.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/popejitowosidipapeke.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/sumijunisuwivanofiki.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/545235fe6bb59d2e422ac52240691259/55231129432.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/m50ls8eta82ud4387rlknqasfu/56372974516.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210527193733.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c602b8c56e2---kamadazadurusadisulewal.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/6a38141cec1c319fa1106dbe499f37f5/nejukojawuzavamez.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc3d2d8ba---mokatarub.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_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 16928 bytes
SHA-256: c8247b55fc85e5d575462085e2f8c7c48282588e2d024beb65551c1cf3ca676f
font_01_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 11016 bytes
SHA-256: 39e9792f010a5b0ad744fb78c562a5bf6345f456ad0d220b8e4c35acf83975a5
font_02_sfnt_off00013c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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