Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1eaf148bed8d2ca…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 13:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b86f4980a7f1663fa43732b54a27190 SHA-1: 75cd18566d251326ff642aefd2b0930324331159 SHA-256: c1eaf148bed8d2ca60fba5b636d69e6869a51403eb49255130aff59f7dd265b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.nachtruhe.info/up/files/taguruwugoxadosagi.pdf In PDF document text
    • https://betenrealestate.com/sites/default/files/file/92058743627.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fapesosinewuronukosu.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rewotalipovewinetowuvif.pdfIn PDF document text
    • http://tercovci.cz/files/file/wenowajovu.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/47379891948.pdfIn PDF document text
    • http://guitarenko.fr/img/files/9509616450.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cf33c0c1593---95160915635.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/85866735320.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f6069e7afc5---64654585837.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/gopukazemivimexalipobapas.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/30343307039.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d4c5768b91915e4fd113a850d17f83bb/nebefapete.pdfIn PDF document text
    • http://emannsltd.com/userfiles/53943726799.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jirepogegekefigalarab.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e0157029---gerewozarag.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/adc29758afd0ead7f4f9a8007d0b557e/zixafo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c53149dcdd9c4eb3b440240a70bd9e9e/95787008056.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/xegofagikizo.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xozoxigagorenofawugun.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a201c888b0387416caeac132561b6fb3/sepowirijivuwula.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611f3f4c016f0---kotikaganeserasax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c58578d31---43909164253.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1gs9jo5gc2ct99n6bopjr1erpv/daxutufevelijuwonuxaramo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jigsaw+cooperative+learning+technique+pdfPDF 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_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 17776 bytes
SHA-256: 011e19b0d3745b745d82789ebb870e30e655f432d74899e100c845788f6769e3
font_02_sfnt_off00011e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 11288 bytes
SHA-256: 2b31d6e8029ba574d8d7cc40126e19fa6c85aaf823fce0542364fac2cf3e465d

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