Malicious PDF — malware analysis report

Static analysis result for SHA-256 970cc0f9a0551d13…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 22:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f73565f05469f08c8ed96936e0d3b3aa SHA-1: 42e75e855f64c5ba1df228478635ce92eccccf53 SHA-256: 970cc0f9a0551d13c82cdf3b8ce9b1efea0010677a6278303c8eb09d974b3bfd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various compromised websites, suggesting a phishing or malware distribution attempt. The presence of a callback lure heuristic indicates a potential for social engineering to trick users into calling a fraudulent support number. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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.
  • 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=android+app+to+play+avi+files PDF link annotation
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nefezidobupebabivajewebaj.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/90588426252.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/josuritututu.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/rujabaj.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/95868365798.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/91570458266.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/20788916779.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/faxijibetujuv.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62716470915.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///denigumilibiv.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/72080183212.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/wozisim.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/tobitugewemedoxovozibubij.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/53ab59451435f047164b60992059a004/moligebog.pdfIn PDF document text
    • https://digireg.cn/upload/33684632846.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bozenobolasizido.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0adbd8e2d2c2da658c75e435b841d706/49184263509.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612e987a26fdf---bitadok.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/duvefuxez.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/kazejemudevitovonamowivo.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/gadog.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/newuxaba.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_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10652 bytes
SHA-256: a9d3d2d795b0f920d1cdd3dbe79d2b34b15591cf866fea8cd4b038952121ead7
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 18696 bytes
SHA-256: a727d7f12480eb2a153f0009837b7f9ad55a20cfa278f90b66c61bd56814d47c

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