Malicious PDF — malware analysis report

Static analysis result for SHA-256 88302822610741cc…

MALICIOUS

PDF

80.7 KB Created: 2021-08-18 05:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 13da7f014bff1d59a50b31c11f0e7fb1 SHA-1: 50d5635389f757c1c44b7c27bee167d87b843e82 SHA-256: 88302822610741cc3320ca0d8669f8566c320b72891b5e4700951886d15e5a33
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://bahtiyardishekimi.com/fckfiles/file/dirimixavosurik.pdf In PDF document text
    • https://sportsht.com/userfiles/file/zikimowovexiloguwoveguwa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/oadkvkg0kh3k6io4r9gsv5aqfd/nojara.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4abea5d375b7a010228186bf2a790d83/mupurilav.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/xexudulevegabolozutifiwij.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4d520945733eff59eed33049bc519bf2/59315644466.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa9ded95a---vofufupusilibijawuwuba.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadd6bcb9e---82741760455.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8fc8e4b2---jovalagu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16227673193311.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/monaba.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c74b70b30b7---xuxinovujiwap.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776f5a8bff---84639810565.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/34ncu93177v3b162ggfcd4j7u1/xupizakusufuja.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fogegazolosoxifoza.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7u06jdr8hufq8baf9k206ltb63/tukikajorokoxusaxibov.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/uu4lgmkm26h8vvgdvdf2m796sn/42063717081.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tidofepafolinemez.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bc6ddd6e---83856043933.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/97524152763.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/muxusuw.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/95006864974.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa819aafb08---26885085012.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/miwojolabudujamebopaw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb573b4bf1---93280457564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dragon+ball+super+mugen+2019+download+androidPDF link annotation
    • 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 11428 bytes
SHA-256: 97c65cb6ee9b227fe9eb8b723a5ad69795d8a3652a40792e6502f130667425eb
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 17348 bytes
SHA-256: d5e9113aa492ca3297cba89bae5b7fcf4d90c4299bdf8b0eb33218d9bb5da969