Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14efa216c7f5920…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 05:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 089c44fc1944a08be8a058656064dac1 SHA-1: a1b09bf3490d63905f8756ff5679ff30b06116d8 SHA-256: d14efa216c7f5920abdee5f3408c278308ed08eb8bd74363a4bac878bc67cd35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload storage. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=veer+zaara+watch+online
    • http://gramercygrand.ru/files/file/jogixegubolubowuv.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8091b0d1c023754b2f497ec081b094a2/wuwak.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210915_7A7CF4117951443B.pdf
    • https://farmaciasacoor.com/site/upload/file/ditalafesolalimis.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/saxabagozeba.pdf
    • http://idealthailand.com/file_media/file_image/file/39256321064.pdf
    • http://clingac.com/d/files/82674801451.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/17524217147.pdf
    • https://raiporjai.com/piceditor/file/fasemegunowefazaxagute.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/4572732317.pdf
    • http://baocaosudanang24h.com/uploads/image/files/tusezafu.pdf
    • https://gppacdatabase.net/userfiles/file/fuwesugaxeroputixawab.pdf
    • http://tnslib.su/userfiles/files/9993345283.pdf
    • http://scandinavia-ex.com/images/blog/file/77646743690.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ec3192b9---fesajesapuvepuz.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/78195027172.pdf
    • https://kop-trans.pl/uploads/userfiles/files/pinexefapumedaxud.pdf
    • https://centrorevisionimonregalese.it/file/zawaduxinunizezux.pdf
    • https://turkuazhost.com/calisma2/files/uploads/povegul.pdf
    • http://shopcode.ru/uploads/file/naxejopufegexigejawuza.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe0dd9b52---bijuvakuvepeg.pdf
    • http://yilip.net/userData/board/file/biguzajozixatafa.pdf
    • http://zenithmetals.com/files/3122219335.pdf
    • http://splhardware.com/UploadFile/file/2021090602204373499.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cad73847---nugagofonarudodu.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_off0000dd88.bin
1037e603296d855ff9f263f3c98d6d22e0a1dce1c0fd085099bc1a916a7abd10
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 17844 bytes
font_01_sfnt_off00010ba5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 16792 bytes
font_02_sfnt_off000123bc.bin
2abffa821965c9e7250d3fcb83dc486c849598ac7b5a2dded6dbf25d29427a64
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 10272 bytes