Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4da1c1c3a28ca6…

MALICIOUS

PDF

87.5 KB Created: 2021-08-17 03:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e20e1c39dde54e72ea43659940ff81d SHA-1: f12612701b3f7bcd996c99faaa2d5988c1907663 SHA-256: ab4da1c1c3a28ca6aa8a240ff8353f97d0940f327dc54d1379d7e3e41215947f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The document also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://inwebjor.ru/uplcv?utm_term=kitten+poop+runny+and+smelly PDF link annotation
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9m0fnqc9scggdgqfi9uq8qccmb/sonez.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e65768f2285edba90df59893d4a79342/letadikamifatu.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/norap.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/14750281224.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/88555711508.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/98191712316.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dabf6cdf7593e53170395dc1caf126d3/wipesa.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/rejulotevametowuto.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/36488515304.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/pseadmuaunslbduucf4uddqi2v/fasekugojejudejeleja.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/1967208570.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/bolumuwevenuwinupotixelu.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/17931544411.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/ligiwexemubisaf.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/jutojubomet.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/libututu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a553a9e07ba---62625918104.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wotodigi.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/nizogolapubexo.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/40418386406.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/fulofakijupenonifedegamox.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/15095202829.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd0314c6b---xitaralog.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/56751fcfd3f24f6fb9fdcb6edcdd3ffb/96107343828.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/xudawebemeso.pdfIn PDF document text
    • 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_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 10756 bytes
SHA-256: 2f678e0132be8b84928459b0523d93220f289bf8e1027ee110d9127e498a5ed4
font_01_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 18784 bytes
SHA-256: fe9769daa82de180e0454ac873eceff62870ec0a86c5e1504b6d6c98606081dc

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