Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac895e449cb7a0cc…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 22:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 983b2e59cb46048a3b1ae7c804f98452 SHA-1: 2f8959d752645a16eee10477e8567a428368a832 SHA-256: ac895e449cb7a0ccdf522d3852830dbae102cfefa9e6679e74643a2710dfe933
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. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to various websites, some hosted on compromised CMS platforms. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pjzhengwang.com/upload/file/20210909_164728_166.pdf In PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/wodivokubotedizidutewa.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/9221318602.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/90183676714.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386126a83c4---poludomegokapeju.pdfIn PDF document text
    • http://huefpdf.org/upload/file/32546779768.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/80034612798.pdfIn PDF document text
    • http://valeneighbors.com/userimages/purigasi.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/29009171854.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/59783743712.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/birusixojezosazaje.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/powijularegejewekupolovo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/nuxenefosirozomu.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/27996181178.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/putapumuvo.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/47752788712.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/debixasijekarikutidofug.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5bbe4bd07---rurufadomupefor.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/68543190171.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kaxezarafexanerer.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/vosureduzedunigutazok.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/legovubutufufezu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d61268fd---juxoxetoxuvutopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ranch+simulator+download+android+freePDF 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_off0000ba7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7D 10972 bytes
SHA-256: 9c1814591e25ded6f9f497cd779283cfabe8836faada6357b72bd325542e40a6
font_01_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 16716 bytes
SHA-256: a272a7f1d565f5b397923a05ba178611c450a32f745364a7fbfce4eb35f399fa
font_02_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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