Malicious PDF — malware analysis report

Static analysis result for SHA-256 766db4c5dd0e1f3e…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 10:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4db9ff76ba3be50e56cb568859cf6e12 SHA-1: cb5b80df1fd1c3716b7810717b91fbd363893bae SHA-256: 766db4c5dd0e1f3ecf43d9a78cdf9f37ccd78b6b8c6756c959cf52cbf18f30c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. 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 0.9975

Heuristics 7

  • 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.
  • 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 http://jualumnitoronto.com/editor/uploadfiles/87715311166.pdf In PDF document text
    • http://dlastudenta.org/Upload/file/tanexopuxa.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156fe4b367ab---90109314198.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210928132715.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/8193374254.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/87270531463.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/93388527012.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/78632647674.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/4219327615.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/fidixunokinegakejexizarab.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/38545193831.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mazakuxoxijim.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/dewaf.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tosimupujovafazegirewiw.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-19/20210919045203928486.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/dibumibowosazibeg.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1615a591678596---purijajaris.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139424cbfd94---24549994433.pdfIn PDF document text
    • http://esteel.my/userfiles/file/pabolil.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/dijiwivaxefi.pdfIn PDF document text
    • http://lukinserv.hu/file/55382981145.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63b7e5f11---sadujavozexosolat.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/vaxofejukumon.pdfIn PDF document text
    • http://gazetavk.ru/img/file/gojutavovabutexavuwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=round+cell+neoplasia+in+dogsPDF 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_off0000b26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 10636 bytes
SHA-256: 9677fdfccfb6634f2c8246f35a41a28f902142d57019d3afd5398361fc647286
font_01_sfnt_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 15680 bytes
SHA-256: 5a301c93c3b4632f840484f88c399e3e9184d24c15feba46903b88e32106b01f
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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