Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3a7e7ced2b2df2…

MALICIOUS

PDF

90.1 KB Created: 2021-09-15 23:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15556307b12839e1c4cc5bc76b7f936e SHA-1: 054d3557ebfd8aecd7605eaa0aabb4745366255d SHA-256: 8b3a7e7ced2b2df2617e543c11b17d88843a69562e676ef2de9e2a5e64430ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, many hosted on compromised CMS uploads or disposable domains. The presence of embedded URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this PDF is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=watch+free+movies+in+android PDF link annotation
    • https://limadelimon.com/images/file/kilidabubuzewemewufope.pdfIn PDF document text
    • http://scsytech.com/upload/files/54354228689.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/49397163335.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/pudowefejeredu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/91258546749.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/49896643563.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5ab48b8e---getuteviginufe.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/20915718456.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/monipagufedulotevib.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/regarimobesakezunuj.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/11023722508.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/tudipevotukarar.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/87636369083.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1ebc6296---difixupofijafupuf.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/tetagesaguw.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mobirukuzijezizede.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a280d7d887---rawifomikiw.pdfIn PDF document text
    • http://pi-consulting.ch/download/dekaniju.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/wobinujolelil.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lexixuvavijep.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/20178896093.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/74582603239.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321da650457---63840212670.pdfIn PDF document text
    • http://simoncaulkin.com/images/geredalozodof.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f561e7629a94dc85e8545caa0295194f/zedeteginosoje.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/86058252109.pdfIn PDF document text
    • http://asfalon.com/__files/file/nimukuxoligazerimes.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_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 10752 bytes
SHA-256: 2d2eb8660319f92534d887e89af602a68b0d44611cced1dac1063b21392d1358
font_01_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 17596 bytes
SHA-256: fbe49bf3c459121b9018ad9e6670766bd9161dca621c303c244ee088c2d8411f

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