Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b6644320ed006b…

MALICIOUS

PDF

103.6 KB Created: 2021-09-01 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da386245e5abfd1f97af0f4faa83729b SHA-1: 8b091d360aef9b017e4eacfd23852d1d40865446 SHA-256: 79b6644320ed006bf53b338e4d4a36e2b9df0ada8fce8aa8d2aba5aa5cd0d76a
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URIs were found, including one pointing to a raw IP address and others hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristics strongly indicate a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://crewmak.ru/uplcv?utm_term=cartomancy+card+meaning PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e002be24b83---kekopetawexasam.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/zowopifatebedez.pdfIn PDF document text
    • http://4yoga.by/pics/files/93832105391.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b66b09c7bdcc901e6d78b755ca8d0b57/97969123007.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/zumofofarosovixunidomev.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/nazibojugono.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4b2e8f125bbe63f9cd647e05ce2cdc1a/69272138664.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wavolekeli.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/9337833855.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/fee5637c467a78184ec5f59bab6377fe/wagajikukisuma.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/zejawuderekukomezatubik.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/46635262599.pdfIn PDF document text
    • http://industrialdevices.in/uploads/misoregerazebes.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49670848408.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/fawavolaxu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430225827371029.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6c73c463---33675357014.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/xidukatexuwoporadibo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ecac3d625---39600915198.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b44e1293---5846728412.pdfPDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080dee93ba9f---28610154140.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105090646217745.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/11449943619.pdfIn PDF document text
    • 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_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000148b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B3 17960 bytes
SHA-256: e58db9401fe8941911f6f674e69cc7d667edb9473feec4fe1cd0d9a93a40c16e
font_02_sfnt_off00017760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17760 10644 bytes
SHA-256: e455775d21122e3765a600f0d31a5b88ac3eabd08d71740600f5ff8a994f9e31