Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeacf96e21bd6c8d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 17:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4842126d7fed8e23e08133f219116968 SHA-1: 46fd461751d7835ff67b2ebc467ff0142d4a3dc2 SHA-256: eeacf96e21bd6c8d83bcd56df2b642dbc7438b3578357fe7a6445f4dbd4c1f2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://mzch.pl/userfiles/file/46271081488.pdf In PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210907180431.pdfIn PDF document text
    • http://rld-carbon.ru/file/poderodivuzukilak.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e81b43d26---82363861318.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/12383957684.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/84077705154.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/99031015042.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/77405204211.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/74489616722.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb83a2cb64---72926928250.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142582855ff1---rejamezivim.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/60982960301.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/s5m4584l3hfb2rcdu57cd2g0s5/73457765191.pdfIn PDF document text
    • http://hanleyresources.com/images/33263003621.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/naxuwopivinowa.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/15029728850.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/71676710816.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613030be024fc---82201248893.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/rapuvijidujafiwekula.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/46930333993.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/jasitejosobabe.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/rizifeguribebivusazexu.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/87357883776.pdfIn PDF document text
    • https://apelhijau.com/contents/files/rejedibefumobu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dupifizimukavatu.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/difijo.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b5ea7623a5f60a1bcaa7929f44531623/29852578249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+white+2+ndsPDF link annotation
    • 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_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 17260 bytes
SHA-256: ef5d2fd511fc30109bff18c545aac45721438012411510c1daa1795d17655547
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 10504 bytes
SHA-256: a86ef03a65440d619938c6eeeb233bfaff816e17b4e5ba6d8e942731e88f732a

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