Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c0f4e451b21a7c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 09:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8990b8afaf4b84bfcdb4a141f17896bb SHA-1: 4c3c467448e2636d419ad1727a06bb8ce9fd9df9 SHA-256: d1c0f4e451b21a7cb121946fb1112bbc3b243ab04d7c1e47f92b5b77b0a4f7fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a3f83ed0---96369451616.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4m50kafk82q370crjvpafvuq41/81616959697.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6c95b807f---61979969519.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148eebdf18a8---98768616741.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/gajuvevepufovaduzore.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/eil5npatjsto3vfo8km2klb6hc/40854123926.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/42133801518.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/76114054036.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161492204d1a11---87221456428.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/5123902107.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/livolaxapow.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/83335308389.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/jonulelewetilox.pdfIn PDF document text
    • https://finliz.lt/i/File/89108105976.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146227dbd4ab---27380878086.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/38334091358.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/d5ahm6t1qq6euqelp303aitgvm/59098882693.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/99953599636.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/24300819136.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161489829374f2---dusute.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/winedekogedoxelomol.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/sowamutetezozafup.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/76030178583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=oem+lock+androidPDF 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_off0000b641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB641 10384 bytes
SHA-256: 92f04c1969190268d059624169508c709ad88bbd45f1b72f34b904f0d021026b
font_01_sfnt_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 18088 bytes
SHA-256: cf40fd3a009fde4e52b9d35657730953511cc802c5724ad6c085cb53b403d3d9
font_02_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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