Malicious PDF — malware analysis report

Static analysis result for SHA-256 93eaff53caf4dc86…

MALICIOUS

PDF

266.1 KB Created: 2021-07-04 13:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f36a98b5868b84c0e6ff02b3ef30fa0 SHA-1: e850f1d9c7a5bd38f1c8f65221b9e24f6fcf6eac SHA-256: 93eaff53caf4dc865aecf2d6a05e0adc2402235c5d77f664e6f2e2ac4f812338
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, with one notable URL pointing to a potentially compromised WordPress upload directory. The presence of external URI links suggests an attempt to redirect the user to malicious content or download further payloads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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://chcial.ru/uplcv?utm_term=my+old+wife+nude
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744c9b940be---90870351349.pdf
    • https://jamisonfurnace.ca/userfiles/files/68544308285.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/32676270103.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3abc219bd5---lesik.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852601c614---71589381630.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/88643029924.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/kajizakuvimowes.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ceecc072b8b51638f5c20d79024db427/37583057159.pdf
    • https://atcotourismtravel.com/userfiles/file/serabafubipenanuxitupije.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i4orvughbnkeq8ktu4v7pg8c60/tebugotazuteliruloxoxow.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a46708a3---8616155970.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bc6410f4---4455379699.pdf
    • http://asckhn.com/acskhn/userfiles/file/todiviribetizeni.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4506bb176---87572400084.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c7f89501b---jalaladagime.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7679675da1---pedotoxuw.pdf
    • http://0851gay.org/userfiles/202106file/2021061213001270554.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1e61ac4f8ad6e4e49c4a6e32d42c592c/72858986001.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2816ddfd87---gukufudupunexuwofefogegix.pdf
    • https://ctsgroups.asia/images/file/85902835814.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905257811ec---63048110056.pdf
    • http://shuswapladystriders.ca/userfiles/file/wafigewamaruwarirusajufem.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72390489775.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003aa90.bin
6a02200ccb54af07002d880ea0dfba14296c51d3d89215c02db327278e62c5fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x3AA90 10112 bytes
font_01_sfnt_off0003c137.bin
6ea6d3f004d46c5f49d9d8c9fa509368e603189b1febc4cb197ebc5e35294eeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x3C137 3408 bytes
font_02_sfnt_off0003ce88.bin
8f5920af07f6aa6038665da066301d6de8f6556dbb368b3daf24c869476ed673
pdf-font-stream PDF embedded font (sfnt) at offset 0x3CE88 20224 bytes
font_03_sfnt_off00040212.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x40212 16792 bytes