Malicious PDF — malware analysis report

Static analysis result for SHA-256 6462ae6dc30ec1e6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 08:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ed1cd7280b7bb72c1c61564ff8967d8 SHA-1: 3cd804c8c714fc94eab231a3163b35c8be398827 SHA-256: 6462ae6dc30ec1e648f4cf293c67e73c6243561451615040992f4adefa125990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and link farm indicators strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://akbarestate.com/survey/userfiles/files/68687889959.pdf In PDF document text
    • http://shinies.ru/img/lib/file/96930143639.pdfIn PDF document text
    • http://innersolutions-uk.com/file/jidamaga.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/54894992766.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/37498584366.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/471253498.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/munejonul.pdfIn PDF document text
    • http://candientuvibra.com/images/file/40995464185.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f905dd69d9---13418253538.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/nokutilodefewitotamom.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/bajodekaxazuwomej.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/6953224483.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/95900920339.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/13936617385.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/romesi.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_02_19_04_03_5657.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0c693ecb---97813674575.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/98090328807.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tepebunapotonulelevapaw.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d8bb4163---fafumikufibujotisob.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2d106f63---59719160432.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723688d2ce---vupoketixizewitirisek.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c673362e3---31110621521.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/94824285324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=examples+of+trigonal+bipyramidal+moleculesPDF 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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 11404 bytes
SHA-256: 919d9346892d48759319dddfdd53c56e0e4bd32d5bfb300accbc08c35a46597f
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 18864 bytes
SHA-256: 667d723283fb6d6243541a834ba6c3f216f44f8d37d01aff398e3cc0a1491888

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