Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb11da15b189bfd…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 04:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1011dbfff70a12576a196c4358455edc SHA-1: efc160fed6c66b82e395a49fc5491368cf996d5a SHA-256: 0bb11da15b189bfd992cfac1befd41255d2d74b84e3bfe6bcca983697e851f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and points to compromised WordPress uploads, suggesting a phishing or malware distribution attempt. The embedded URL `https://nomylo.ru/uplcv?utm_term=final+fantasy+x+apk` is presented as a lure. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=final+fantasy+x+apk PDF link annotation
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xegimipixed.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/pumorijirideni.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/84541234171.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/ladevasanikivumezatetegur.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r635ne0jikc9p50uub0v6066v7/niwitok.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/63034167003.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/mepukerinipirutimerite.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/doxagovidisawaxegajuv.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/11807955875.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/16571122893.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bd38bd9a2---zolumimikasozuxapafagoneg.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/70621513619.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d65d9a0e2dc74aa2faa5f7128728d272/88704724018.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/nufivukibo.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/vabovowiviromago.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/zogelawolikivim.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/53652893542.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/6411647495.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/90411358247.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/97747789581.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/dumejo.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a33816ed6f.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/wuwul.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/38169839973.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 10284 bytes
SHA-256: 70b3a1a2f478e9812c73127cd79479057bee9efae60675f52674ac4fb6a6e095
font_02_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 19832 bytes
SHA-256: df987c53c15969620fbfd9120f6c7aa5f6f3897a1ba5d68a03fefd0ec7a443f5