Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fb7d851b1dbe1b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 03:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f80530b068767eb7e9c44fc733759ad0 SHA-1: 66cc6ff4f065c2fb5fdda546b87cd8235132bb06 SHA-256: 65fb7d851b1dbe1b7564be33d930cf0baab62fe7abd3c54978f53018835659c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest these links are part of a link farm on disposable hosting, and ClamAV identifies the file as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=clash+of+clans+level+10+cannon PDF link annotation
    • http://elencostruzioni.it/userfiles/files/83888605238.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/degijegonugiso.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/81255758744.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/12183050693.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/89873859336.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136294db5af6---dezob.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/93601784464.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/21950450870.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109091400251146.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/vuvazoxukokaseku.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/94626380769.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/92142764e764f8498353e1a4b3c3bbcf/49549217263.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210916050443.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c50e204c9---86048550354.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/jowegaxe.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/47618210252.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/xuratilikuv.pdfIn PDF document text
    • http://aprt1day.ru/file/merebagibexezesusumatibeg.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/lexinafujewuwevodo.pdfIn PDF document text
    • http://geodez.com/pliki/file/mifojelofipaluwejodo.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/78771576197.pdfIn PDF document text
    • https://bdata.vn/upload/files/85766549760.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c338f5adba---52748981962.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161383ae216481---64289919898.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/tefeza.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c045477592d4d2d8a9f428e97649592/52373072265.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/67082950186.pdfIn PDF document text
    • http://thegioivaigiasi.com/Images_upload/files/59714505288.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_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 10412 bytes
SHA-256: 8c05b60edbc9ff9018f1ec4fa964f2fec5430817ba42e30f0f6904a33d426e7e
font_01_sfnt_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 15888 bytes
SHA-256: 82cb72a4ec4fe8ab4554df8918369de8481f359168cc8eb0683808d72d44535c
font_02_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1