Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa44e1518218553d…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 17:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a29073666843ef5aea05c3ea685c0b8d SHA-1: 984dbebcb13d456741b92e719228ae6523557764 SHA-256: aa44e1518218553df9c2012f8da47595ce18d927c33c6fba01a8593441fc02eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://crewmak.ru/uplcv?utm_term=who+sang+you+got+what+i+need
    • http://vorne-sitzen.eu/pcms/content/file/rajanujujebidi.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/83573270370.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/17120330607.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/62t3rord84jj39v6ao9rbn816q/28398882405.pdf
    • http://101-games.ru/images/uploads/files/69626296340.pdf
    • http://alexlunacoach.com/img/editor/file/72841194268.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6da0e6a4c---27097928960.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1b6909cb---dokakuvedekotefasonum.pdf
    • http://hb1004.com/userData/board/file/46107827178.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d0df39ca---baramurov.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a2402938003---66726945935.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b33054aa29c---15079801523.pdf
    • https://armandofalconi.net/userfiles/file/17103811370.pdf
    • http://smflow.in/admin/uploads/file/zawuwuditosi.pdf
    • http://duonglaohanoi.com/userfiles/file/rijidokigutulip.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160706dba25b59---kexaruwojoja.pdf
    • http://okwmd.com/upload/fckeditor/file/donubeputugokeperazisak.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df223f6c13384919a8513184ef1a6d0d/32460627232.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1af09fe9---pozixobiporu.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3e1c32de---49605995631.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f058c2ed9---49753766080.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ppp5anmqd4h2mkdk9ahrn3vk2i/24805181150.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/07bcc9bd9c491b18c2bbb40122962c44/40512266982.pdf
    • https://bhsbeacon.com/FCKeditor/file/2041157231.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adabcec618a---42343274432.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_off0000da22.bin
199d97408d4d3fe38be63568c821c32f443c28f82678cce2f760b31fa9d318c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 10676 bytes
font_01_sfnt_off0000f27a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 16792 bytes
font_02_sfnt_off00010a8c.bin
998f79facb72262e0af832340c058f0361082c9ff27f49fef3ac53914a0b8812
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 18192 bytes