Malicious PDF — malware analysis report

Static analysis result for SHA-256 80957ec7a1c64e8a…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 23:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0efbbc6beed67cb9881ecd22619506c9 SHA-1: 15ecdedc58b944c13bc7517f851d4f826c2f5350 SHA-256: 80957ec7a1c64e8a6bfbc5f7a19918f927e0de3158388e18ed617e67afafd96c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to mimic official communications to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3480da3ab2a8775228e569083adb6a58/zabimikuvotibogasab.pdf In PDF document text
    • http://tannhatviet.vn/upload/files/2003244500.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/88996393634.pdfIn PDF document text
    • http://axwelindia.com/uploads/pakakoxituropedif.pdfIn PDF document text
    • http://canadanur.com/resimler/files/5750552361.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/05cfe41f37a13ea947f01a258550af65/sonuponapebare.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efc079ba6---33477973240.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/wipepija.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/kegix.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4461c78d---28259407953.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/20145412204.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/bopijos.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f706ceaf1---79401532250.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/ca9a8472c184b4f6b60877d04359a488/gapewovirudes.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0597671938---mudirisukavireme.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/70db836b31300868873c0ffce17e0d28/wajubaro.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c735fca7eb26df839f807c19e5f15b7b/fawumitaxabifalipisutibid.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/dosipunopinawazuxebuduva.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab774ce912---wuwujinitilavite.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/82f94daa8d6892b28a8ec8d0e0e9f057/tunudenexewedopobo.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/digigusikuwavirixemirodog.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4cm1pl9m8td9204qlhdvsrsicf/vusemu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f2f63938---regimig.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/mewosizix.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/63164917945.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c06a1e6cdbb8d419e8d9dd483c25c58c/morademilorutivukukoreg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=160+hectares+to+acresPDF 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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 10328 bytes
SHA-256: 7fe506ebb5478fe28d989a061a7950f10d4b080eadd1e1de05b6238a835d18aa
font_01_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16920 bytes
SHA-256: e95f2c0a61e5d45b9944cab0f576164908d9b0332cd1a0f840737bb68ee3a58d

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