Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad59b6904665b38…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 08:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25032eab308e39ab09d8d4a26440fdb6 SHA-1: 06ee4593219d975ac211299140f04da93faa9f21 SHA-256: bad59b6904665b38181fbc4220984b22ac7745eea6c201028d86318ebb7ebd8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://portalinmobiliario24.com/uploades/fckeditorfile/18416264459.pdf In PDF document text
    • http://119pump.net/d/files/79143958500.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11616737856.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/85905624134.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/55066241751.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210529213755.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607928a62621a---36719897700.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf8b15ab3---70248917400.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xekewelisebakal.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744820330b3---23314141084.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d168a6f8d---84727267784.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/zojerewemezofafasobise.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bekanoronezepow.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d6ecdc0eb---tomegafogadiwixuxosarek.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/49038255833.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/51056824638.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/519a2f6952ecc60e834c993275b6479f/69090723331.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/kudofo.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/sasulesalasujer.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/84941021010.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/kopavirisikizo.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/dapezabigewafufefigiw.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/wuser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=equation+of+plane+vector+formPDF 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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 18308 bytes
SHA-256: adb6789958433f5918901ded4d659a43e3323fde545899480f32a507c3cc2cca
font_01_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 10768 bytes
SHA-256: 6dbe13a4d9d2a4f3afb3220e54e8e604f191a30aae1cea4a42fa8e17215d1536
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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