Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad31cecc8693b25…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 06:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b3a2a9245369761f4ea3c69c76d5048 SHA-1: d1528d7940c09d8fc00a8a4a8606475af121ae14 SHA-256: 3ad31cecc8693b25a384d2aa9f6a162aa436ef342db89ebb308abb81eea1c561
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs and links to compromised CMS upload storage, suggesting it's designed to redirect users to potentially harmful content or download further payloads. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=foucault+and+the+body
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7dcfb195af09b1e50b8ed74a88c69610/83564112663.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/37462049507.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d19u4fmektds64s250hd96hpj4/najasomola.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/lqfjsbsoicr8ghpde5cn70empn/82594050323.pdf
    • http://teakdeck.pl/files/file/8192951743.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5ba2ae43---kaleluwunorerasemufowaz.pdf
    • https://readandenjoy.ae/userfiles/files/goxoxilowabatuvuzub.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d617ee3a84---tegugujesivilus.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9d44a814a---59462587690.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfecb94277---tosopenerar.pdf
    • http://atut-biuro.com/uploaded/file/jipiviburinabama.pdf
    • http://dental-forum.ru/userfiles/file/36240209121.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hro3a6gtnls7j1rrrah6b5iqbq/voxakomenimetukij.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f6555b39232b4b478b9119b20c256dc1/moforuxadodekurivaji.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/17859855100.pdf
    • http://btc-ltd.com/upload/file/virevepadojasafujegazojur.pdf
    • http://qtjdb.com/UploadFile/2021/05/25/file/20210525_160626_182.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e977279b6ee3e120ed4ea44fb54cff3e/76429023109.pdf
    • http://dunajecbiala.pl/upload/File/76997542167.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21f3e4ecd---kemumojagoxudonigozotojif.pdf
    • https://krone-murten.ch/userfiles/files/zigap.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021051218053073499.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d8e9d746---takozatulomotugutidonab.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_off0000fa7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 16792 bytes
font_01_sfnt_off00011294.bin
988f220a219e3bfe8d4fdc633104b2e9f880508f5bc2cdac740379c36b91431b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 10436 bytes
font_02_sfnt_off00012a2a.bin
9abb55edbd41773c2a31679239a6ff63d14fe63526cc42d8cae7f7e8d0df3d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 17488 bytes