Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c86e39fe015374…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 14:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fd75ad5f20eb76304917100c8da678a SHA-1: 8acacfcb2f9c30a6594dae2db0aa73870c605cce SHA-256: 68c86e39fe015374469d86cd995a93864802ab8852d58e6092a69d0ea8f2fdf4
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to potentially compromised upload storage and disposable hosting, consistent with phishing or malware distribution. The presence of a 'download button' lure and callback phishing indicators further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/24512083888.pdf In PDF document text
    • https://edusfera.pl/upload/file/zonenexatan.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/53161464498.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/lejutunelodemobijife.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/55376574301.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c261bd15f---72112659764.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/13076810543.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/36119607253.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/34481829245.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/litedetop.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d9469f5d---sasekelejexepa.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/50jqqpf7nk51n2eld3d05oom85/97879901995.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/kejapukakeviwepon.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/38534620689.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/83233924733.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/32485690317.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/35835194857.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904023531718.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/83066892907.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pofevo.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/norigikikasovuperej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+cricket+streaming+ipad+appPDF link annotation
    • 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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 17036 bytes
SHA-256: b851fc468af1fd995e7d55ba297a0f1eba368b63f722cb13ed643a536c444abd
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 10804 bytes
SHA-256: 82e55abcc455c417d0d35d4fd89932e3dc16d5a266c41d357e1d2edee216c390

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