Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aacd0458bce992…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 03:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0c0eaa9200e457bb869d0448515359a SHA-1: b72f93f0ee52443d24ff8c4ec392d26dd7e0c13d SHA-256: 37aacd0458bce9922465e7b124c29ce81cf94d8810424b9a4a1a3dee0ce59d49
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. 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 phishing attempts. The presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=pokemon+nds+rom+deutsch PDF link annotation
    • http://sz-nuoyi.com/Upload/file/2021091519313325538.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/nilerakikozakusir.pdfIn PDF document text
    • http://gaudi.tw/upload/file/wepesarogewadukad.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614291dee3a29---5945565639.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/73d6b7f8786034e2520ab3be6ddcb414/10168267832.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/duzipelatidu.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/romewimefirerunemibunad.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/86373282410.pdfIn PDF document text
    • http://medrea.ru/upload/files/20956853852.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/kerovitogoxiziwoxevilus.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/kakonixegig.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/91165067034.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/90336819800.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tujesapinotobisekakore.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/jusovumezajo.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090708504473499.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/53673256570.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/wopisokomepajizalomosuxi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0abef3455980d7dcdfff8ac25d70536f/42698004981.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b9d5cb475---zebuti.pdfIn PDF document text
    • http://www.siposferenc.hu/html/97114873490.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134266c75956---pitopudadep.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/33441205547.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/56628515124.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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 20000 bytes
SHA-256: 8a7dbf4d3e5ce4bcb40f7ce74211b458eae3b65875867e5dcda0e360ffa89c07
font_01_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 10528 bytes
SHA-256: 901f6e02456c098a750197212d2ac1d61911902119cb7f04d198be687a5bfa10

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