Malicious PDF — malware analysis report

Static analysis result for SHA-256 1642436b179aa4ad…

MALICIOUS

PDF

101.7 KB Created: 2021-09-05 06:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b071a337b362b3a25f7b22d2bcbe173 SHA-1: 06bcf18f212f4683259d5d0914dd4f0326fff742 SHA-256: 1642436b179aa4adbe4d629967c594421f52a6727ae62a3f5b1f622128370f07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further supports a phishing or malicious content delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pho32shabu.com/uploads/files/32011703479.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/59393502582.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610074adde809---mudutufepixipiturupogased.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a60d26bc5---tiwonopolamilusafibo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad82cd394---wasejaximuvafupuximuwiw.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/xuganubefekuboxikatep.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/07afeaec5c05445835d1457e0270ca92/80477848238.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k5a9khocqf375odna6qbl4qgc3/42664159704.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/kejofegupefape.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/53392125201.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/dipuxametivoguzasimetu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5f5621b81253bd449816ca32b15768bd/sojekeri.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c3d1575f1f7bb162c9dae1d90352b0f6/52595129084.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/60c4tn8tditmr4oq8k8jm9ivfd/47134573981.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/50132755646.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/48a95d5f9616543bbbfeb006d8f42011/39902334484.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/35180329731.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57dc9d7c79ddd30e20cc51f7d84d962d/lujirezedezot.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa4ea68b5---guguki.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955b74b18bc---39321782336.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1e92fe11ca9b04a7b682491bfe6f1b50/40412456508.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/13351887989.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/gikulikiziferulozag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=civisme+et+developpement+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_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 21252 bytes
SHA-256: 9f761a68bc41853d3ef77b435a1cf3d3c41053875ee798c214871da36d7df199
font_02_sfnt_off00017165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17165 10492 bytes
SHA-256: 47097259475023c2ae1b10701e0354007bf1f23219b3da64e821cd21e214f087

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