Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f117bfff8441332…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 00:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c26626833c646840b18cd5ebe92493b SHA-1: d7030b1712eba9d4cb07f98359214ec5358aad7c SHA-256: 8f117bfff8441332dbdd5c1403248824e8b9aacf7d227f43b5426231c0c38d13
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, with many URLs pointing to compromised WordPress upload directories or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=avengers+infinity+war+telugu+movie+download PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767f2b426d---38051768550.pdfIn PDF document text
    • https://granitnet.hu/editor_up/59259318399.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/48623034948.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/torakexuwejugonikusovero.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/zijip.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/86058302673.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/wabanonejoveriwosu.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/11998697850.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d4502c673801b1a4c64ace15cdb1bbff/96397551409.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/35775542867.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/35692734339.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/12291861164.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/79500189633.pdfIn PDF document text
    • http://wjcopy.com/upload/files/mijakoxakaxajabudodi.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/jefipuxiwunofogosu.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/perad.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/54579835661.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/96337809386.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kudedafofafowilimobuxoni.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2b0eb88bff025253bceecef0f73097d5/nelidonikisilobizupoga.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xuwexerirotetetudovurix.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/fiziz.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_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 11044 bytes
SHA-256: 14733acae436e6866f7d7d7bff0a9029db0214286ea696d318324f903632febf
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 17620 bytes
SHA-256: a7df4a5b13c09357295130b5c6a7513531e12fac61f1ce263ebb4d0f1e4d29e9