Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5db76dda9d093a…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 16:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c53f63acf19a738f9d55ab36159c851 SHA-1: 72c699b34e5982fb3bf3750223a74f647ea204fb SHA-256: ae5db76dda9d093adccc3e29a3d2d23ff1241de8c47dbf3caa3a703398b2e633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=how+to+get+the+ultima+weapon+in+kingdom+hearts+1
    • http://sasnowosielski.com/ckfinder/userfiles/files/96366969653.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210901_E9A72F846EDD7163.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/56847084319.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613783b55d2f9---gedijobevufok.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/pilodosimox.pdf
    • http://forti.in/userfiles/file/rufeluzoraxunipisiwi.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ec84a596---sedopiwuz.pdf
    • http://playeasypiano.com/resources/fck_images/61308486558.pdf
    • http://lamorenj.com/userfiles/files/97533510544.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/37499593256.pdf
    • http://chayka-svg.ru/files/52129455004.pdf
    • http://czyxchem.com/upload/files/zinanigobonugazopi.pdf
    • http://zeci.nl/im/image/17174133476.pdf
    • https://aecvfcom.nrgence.com/upload/userfiles/files/79186522201.pdf
    • https://ww150003.linebot.net/upfile/files/20210912005343.pdf
    • https://istanajp.net/contents/files/75340663783.pdf
    • http://chuaphucluong.com/uploads/image/files/2895916029.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161522509d65fb---9510763148.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345e8995a18---50134322750.pdf
    • https://kudusde.org/resimler/files/rakudarejekagozexe.pdf
    • https://astdubai.co/userfiles/files/xesetizozexupamow.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161584f8858e8d---47439280215.pdf
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909065640189807.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d4edc4941fe125d2909143bcdab64662/69023811079.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ugdfpd2p75dku5e6hoanaj26cs/13944439424.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 16792 bytes
font_01_sfnt_off0000c9be.bin
e1c5c38917370921140fc87d3426741b9a5ef81297252f9d955635b31640323b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 15192 bytes
font_02_sfnt_off0000efc7.bin
50bf2b3d9154f9c5388ec432e4126dbf0cd68ff298fe58132b7390506a7b2603
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11160 bytes