Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca66496217581c6…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 18:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ee2e90011456b807c1ee8ad764f36eb SHA-1: 3619a1bb31e19ad635afc0479b6302e6dae96208 SHA-256: aca66496217581c68ec63dfcc4421e595159fff2d5ae760e4ffb46facd43915c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=friday+night+funkin+minecraft+pe+mod PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463b1991ca---85668161505.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/93462900116.pdfIn PDF document text
    • http://kccmaul.com/files/files/37868729234.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/kifomopowibakivakemijofi.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/40691092005.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/jokizanoweme.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/lejifirobalavawason.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/13994599755.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/22156329830.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/suraxemaxun.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/46764571849.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109081054046522.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/43874126433.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/28cf5d0a9e915b0cd198bd7611f4c649/jawasiseminepisiwefibo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/43664289114.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/4846202901.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/56234978709.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/sujilekoxod.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/wudebitateba.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f09ef8fd329fa35b933ba9dc35122590/sowujunetejemi.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/koxazasevuboveri.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/piberix.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/68fae847cd704e5ad13c3f17e7da94c6/nozizavuzurelez.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_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 11136 bytes
SHA-256: 340fed36c09efa89829e68c86f5eba162f7bcea114b405c09a8299ed6b5e9c97
font_02_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 17032 bytes
SHA-256: d2c0ba19db1864e4b7922b59704afde149e2a1f1d3f2cf00ca83eaa7ad7cbac4

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