Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3fabcd62fac6f1…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 06:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85ba81fd6f3a37b6eaceacbb4119807e SHA-1: 7a3bbcb97f8a34574a75fcb89be17844c1fa4706 SHA-256: ed3fabcd62fac6f141c9483e08fbea5a3300a82c5399005d7bb78a71bf756cbf
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other unknown hosts. The document's structure and embedded URLs suggest an attempt to deceive users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333403c9f1b---wenivadewokur.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd62aba803---27865480131.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/17665556414.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-23/20210923142843120697.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/vuzipese.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/38235891236.pdfIn PDF document text
    • http://djapm.com/userfiles/file/64799589580.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/bejamis.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/51811225736.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161526ab9800bd---dukog.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f215ftrqgd1gn83rdn5knc82a0/pakabadarasojozej.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/40545474502.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/915046833.pdfIn PDF document text
    • http://adice-area.com/pictures/files/sujagibodum.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906115809.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/ziwavekesimanesekunawatof.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/kasarewedorugaxef.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/naxulezobazolimarosemo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/17476191705.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/wutafebadodubexagotesonej.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/moxetewiluvujanemupegibuf.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/54861360971.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/67377345653.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/povebom.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbb7056a95---wobinesusevavogajuder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wrong+turn+last+resort+full+movie+downloadPDF 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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 17264 bytes
SHA-256: c935d11a2f3d03a244200193883a0bcf317d15ea9dd80f5f7a7db0f4f13cb1a9
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 10940 bytes
SHA-256: f5b9c1123f457aa213bb8edfb8980e88139e34326411c4c44640b9f3d562cd66