Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90e07539e6e2956…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 04:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c621780f7b44a0545014baa254abdf9 SHA-1: 4f0acc4dfd1151a39ff8bfb78bac309107adbc5a SHA-256: e90e07539e6e2956b1c3b94d726ab12471c7d6606941c3653eb596eeb34ed65b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=pub+ji+apk+download PDF link annotation
    • http://nitexprofi.cz/userfiles/file/96344712366.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c7c8995ed714e5d2a123b47673a75ede/ludofiburapabifujami.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/ranof.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8fed268cae554fab7733ddf707a0d022/73064752316.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/tekopepenujizejuwobevem.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/14834813041.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/77801685737.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905064250.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/sofaladutuvide.pdfIn PDF document text
    • http://aromata.ru/upload/files/gemozefatomi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/50637711038.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/7330599985.pdfIn PDF document text
    • https://guijek.com/userfiles/file/13958912911.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/80146691014.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wejogofelorukurufapa.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/vukamexum.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210903000943_918985476.pdfIn PDF document text
    • http://portableandcool.com/files/files/nalarizibebapovela.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210914102600.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/48623243763.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73a5cdcf2---70949022732.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/muxedeluveniso.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/73094927534.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_off0000b6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EA 10436 bytes
SHA-256: 2b843f1e00e687aedcd158bf262157d0b26195ad9e8787f1d236cbbc2453f92a
font_01_sfnt_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 15584 bytes
SHA-256: e7fb504f48f135024373caf1aa010972a68988655fe44389daa97a0fa554026e