Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccaa5e570e2e12e1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 15:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 720b8d5ecaf296698a053f9dfce8399e SHA-1: 1805b1b4bd1d778dc8c151e524220b3b359f53e4 SHA-256: ccaa5e570e2e12e127675af400c26503566e3c7904bc6fd3d2dc1bf62297b459
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan. It contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=sensible+soccer+for+android PDF link annotation
    • http://karate-talence.com/newsite/userfiles/files/63569061137.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/73491373675.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b44cc730---sokuxonufufepero.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zotabazevenalakitaj.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/25382046290.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/mademagidos.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/65575493512.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/fokazokisejo.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/dozilizewafinumotuw.pdfIn PDF document text
    • https://domilot.com/uploader/files/puzanone.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/lemujofim.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8cbc934---49305161993.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/nusezosijevadirubu.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/gavukexop.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zivulekenelenitob.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/datis.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b5bf62eb6572f5577694456f1a34ef5a/32191673956.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/gediveraralibubetuf.pdfIn PDF document text
    • http://decorstore.eu/upload/file/wesuwejusumufan.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/viminodolipubokasosenul.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_2BFD0499974FCE2E.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xuzetizemow.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/55796247300.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/tolopaxexoli.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/zadaz.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/rijigupolixozaw.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_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 17168 bytes
SHA-256: d5476cecd8cab45cdb64955a1d13913f8a5c7dcb542698cec27c1963ffb8560b
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 10584 bytes
SHA-256: f280211f839fc3b960652b02014b89db9057e0541627db0f3900cbb18f17a3c3

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