Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cc28dab26a8219…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 11:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81887edbdbd80cf701fabd4a1fc07fc3 SHA-1: 6bf166560c2d01bf63ea2b4ac65e82f2b185f38c SHA-256: 65cc28dab26a82194ba90dd4bbff3b0ad76064754f1dfcce05e218fe2855e5cf
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 compromised WordPress uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable due to encoding issues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://limuzine.md/userfiles/file/71348432581.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49416c7472---84984418011.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610b682e7507e---kiwus.pdfIn PDF document text
    • https://grouptm2.com/contents/files/78065468470.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/59048801631.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/besijog.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/tepuda.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/kixolorowepopudoparo.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-3/20210903062158775164.pdfIn PDF document text
    • http://18554080.com/userfiles/file/junajazi.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/08/202108250423126687.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c66f19d4c547fd4f3617d8264f6e8f07/wufulegaga.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/56731889206.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20486522c---zepitepoxefuxowuponovox.pdfIn PDF document text
    • https://actorconseil.com/files/file/xuzopor.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/39102075897.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/11667517342.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7e50d627929deeac1b8bf34eb60a6268/lisefokanona.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1cd4fffa---37304801055.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/89756857861.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/fituxuvuti.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ede8792dc9b63a16c7c7f6189f393b29/50563126657.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gejogidelojozok.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/47dec80a584e34bde5641f0ac7162fa2/77911483079.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a8fe8f32c---madukaxawumogava.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/94eb9cdefa5f04dc67a4187537ea33ec/lopoponabeda.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/9360502241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=epiphytic+plants+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_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 16876 bytes
SHA-256: a260eb89c86d07eb4715ff56cafc180734a2f29b52bc4a0b902b748d9ab9856f
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 10460 bytes
SHA-256: 3696462d4417d6a52d71281d345b88398ac71c08376419910a2f64af99dc0966
font_02_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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