Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c7d0b93dcd3168…

MALICIOUS

PDF

189.9 KB Created: 2021-06-13 14:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0078782e1e3e28e60dd01aafd769442e SHA-1: 3b32f2f0ad3ac704d6e696d5a0cbee8c1c7555bf SHA-256: 88c7d0b93dcd316873f0b6302b1bc557ad8644bda4f0857812c7614912d3be96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farm heuristics further supports this, as these are common tactics for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=miraculous+ladybug+season+2+episode+7+english+dub
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/dts55e7hjgjfpthtu19dtater2/36531719362.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4357fc2347ac07d7e263f9dc9c7103c4/xezori.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/61dd920a451a479004d925b29262db80/26422963044.pdf
    • http://garmagostaran.com/Upload/file/97960867101.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/cfbec5bb0be3a8abdb921031531057d1/delokotomazikoguxanu.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/resoteku.pdf
    • http://villa-carlshorst.de/sites/default/files/file/wuwovawewagovuwibulemasab.pdf
    • http://fructusartis.com/i/File/jitiw.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210611185638.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609540c9e27ff---91511758369.pdf
    • http://frangarcia.eu/upload/file/laxipoporuzaxekuraxu.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/a6be6f03cc8e4e089beb0315944fb12b/24738112469.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ff2kqceg0ljjkgmtugtu3ghhv4/varifukibaxediga.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b2a6919a---7406009446.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb8e4b891---lamuputepumukisiwuk.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b830acc05---pejajixujotolejaritetuv.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/scstjeus7i79thlu77uogpu3nl/pofum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026f53.bin
2f0d859292a5f3b4f14ddb345b50e0886694931cbddd58c9f19e6ad1b7e9da17
pdf-font-stream PDF embedded font (sfnt) at offset 0x26F53 5608 bytes
font_01_sfnt_off000282a5.bin
7e205377c8653e084f6c556bee259288aa1a3ce0f19c4c3a4d30113627ac8cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x282A5 5792 bytes
font_02_sfnt_off00029661.bin
5fd8f7bdc7ffe54b7d0215ceb9afd53225e662fcf47688942b8c343a517aa0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x29661 2944 bytes
font_03_sfnt_off0002a2c5.bin
ec90ed6ead8e7472cc8ceb3f214d8332c63821621119fc95452f21872dc8bd95
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A2C5 14492 bytes
font_04_sfnt_off0002d13c.bin
40b44182529b9159ad0f4a982ccc583bee00479a340e9bc1d4c172404d92fff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D13C 16672 bytes