Malicious PDF — malware analysis report

Static analysis result for SHA-256 091152a6583e1d72…

MALICIOUS

PDF

100.1 KB Created: 2021-07-25 08:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0363bf01b96b730c8c4bea1f1f3f182 SHA-1: 73cefb2542ec900fa320f4e8ff4921a035568207 SHA-256: 091152a6583e1d720e8f23ed7ff4d4cd362c6f96e035e4ae0da03b09d6a39a0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9669

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 http://amctop.com/board_data/editor_img/file/202106261443.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40586c1d8f---71785052348.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9343hiepuq3qjkplbeakg1a0v7/vajupeludizubuwobaxose.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/68667788298.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/gopulaxir.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/82717146735.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa8d62e56b---93207043908.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/71260vosasdijrjj7pueol0sol/mufavifopugutode.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b16c9031---61068556958.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b56bca0d17---79049344479.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/63575069167.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/pidofovetidajaxo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/63056342684.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/muramenatepopelof.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/46682076519.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/mezifuzitonagasoxobemaseg.pdfIn PDF document text
    • http://vo23.ru/upload/file/tuzavumo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/poborifamimusinonib.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e7jvtffieudu5gjeo7c2aqp0b5/46880448027.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/14813071289.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/34966806010.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a30c1908---lujunubixed.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb43df5a911---7179785730.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/naxufonijaz.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391f3cb220---49689174128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+connect+jvc+bluetooth+earphonesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b17d5cc79---tuvubuligiru.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_03_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 10892 bytes
SHA-256: 8b6cd7dd99b47d21e855c88a27a8bb32b2a22ff6b6f87d6a83276d6b0f642312
font_04_sfnt_off00014da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA6 19364 bytes
SHA-256: 93ece6d3fbebf62b6e1f58dbd19b539e6a33652094c08003d1693dc1ae8a160a

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