Malicious PDF — malware analysis report

Static analysis result for SHA-256 843c83e82e8fb270…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 14:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 62fae119c4288436bd505578058e9b47 SHA-1: 72065a5866e9f50f6404dc6882d0d33093c8dd09 SHA-256: 843c83e82e8fb270b0a3a28a9c67c5a8cfdd871b647a24749c430f77c45ee4ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is structured to exploit search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=how+to+take+picture+of+your+screen+on+android PDF link annotation
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94232331274.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/gesimokuniredudibupafawik.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a6f20a48---528020515.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/sakekagogipunedarupikin.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/goxisozavirenizonixub.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/10678332219.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5116e4f350d0c73ea1610bacf081217f/59258501531.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/97450496457.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/86905725489.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/kedekawakof.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ua4felqlbprul5jn5tn88r50mo/siwepomagokezurenapugule.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210904054430_y37pyu.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/jijadasotosulubilal.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80078195098.pdfIn PDF document text
    • http://horvathortho.hu/tmp/vajagovutigitimufulemobo.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/wowukudamuputujawivufemo.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/jiwupopepolax.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/paxirawopiwuko.pdfIn PDF document text
    • http://akademibt.com/resimler/files/sizaworapododo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542dcdbc548---geparipovaliru.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/xariturusasezupexil.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/26486535696.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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 10948 bytes
SHA-256: 79f19da52354339c9e2cd3e32e606a406501ae5d5645396333a2c2f228e30249
font_02_sfnt_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 15604 bytes
SHA-256: 7fe27a90d5f04f39446dde83aac45378fd48a1a164d3ea7310878d519f6cc363

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