Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0c6805a316f17b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 18:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5869ddd405940a91bf7d342e15ee6aa9 SHA-1: ce7eb4b2cbae5722922111d1710abfad6f85c5d7 SHA-256: 2d0c6805a316f17b8333f3a34fa5aa1eeaf7a0d886313249c773cb8750e73490
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://standardamulet.com/files/files/57226469905.pdf In PDF document text
    • http://bassbasement.org/userfiles/file/gapozumujofetirutati.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d2ec82232d29319e08a6cfc32737a1a0/xijizodopewu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca1a37f744---xowebili.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/xobebotusu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/lasopopufebowo.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630690988.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/81773845067.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/26961480835.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/posexusidotokin.pdfIn PDF document text
    • http://aprt1day.ru/file/38434705015.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/fodavulewimako.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3800aff1---38197509875.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161446a8397793---kanavuwikezil.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/45839551807.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/lejegibadomotedanim.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/41927720107.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/tugudoge.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/12697985602.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/ruzugivera.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/wopajadov.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tofinase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=group+call+in+facetimePDF 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_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 10612 bytes
SHA-256: 88f545011e82cc9b34ecfe766ee37d62adcdefe1613735cba67707a1d8d3ffd4
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 17280 bytes
SHA-256: b409995addb0a43029fdff9dbf6836dace351d44eed994d7808249734ae3e461
font_02_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1