Malicious PDF — malware analysis report

Static analysis result for SHA-256 4452556b60c7adfd…

MALICIOUS

PDF

84.1 KB Created: 2021-07-06 02:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 27ce8f859cdaa7ac9632b08bdfec478c SHA-1: 7beecde7e07cea7446707f1c9a76f49306e5d50a SHA-256: 4452556b60c7adfd74781b228bdfbdc91d90077c3da0c7a02ac96d32a1eb782a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS 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, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://csp-pub.com/stockages/files/nukevupilen.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/huujrpsj5m9f2ggq1ammp0gpiq/febuwibagu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c5b620bc5---nulasebenapivusexuf.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb8d33351---78238342296.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ca6709df---guniw.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/82268517228.pdfIn PDF document text
    • http://babamoleskine.com/files/file/47678976516.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6jljdivgg6ga1g5g3kcsn7r110/vukigipuva.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36d882a2b---1720650844.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uebgkb4ddrjfql48uuh2uu19kh/lamam.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/669f469d346335c607678922b85a490a/mivujaroropakebexe.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m2hc0ljahdb45am0rfg5ubk3mc/jazikekonoluwuf.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/girodifura.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/84911954334.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeccee28c5---97951114524.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/26470762362.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe24aa580---18906102660.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f687dc369b2af67dd5b0653d11eb7c46/74871394185.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/d6l05btl5lclctghv8oqjb3lt3/dadoxa.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1d5c0a24d997719c7095fa59f0298b80/rixebafunovewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=color+fastness+to+lightPDF 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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 10524 bytes
SHA-256: db0c00363c6c344993e768a0b5d1554af05ea680ed5fbf26e5531fc0311f3dce
font_02_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 17360 bytes
SHA-256: b00f47910e1268158130e2f41e5e7822599189e25e292fa71da8e5abb26e49ca

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