Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b6acba975c1e4e…

MALICIOUS

PDF

89.5 KB Created: 2021-08-19 12:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59e5850bc76f88c339a56365e93461c0 SHA-1: a17bae7c548301f5a587d2e4c7ddc7befc390486 SHA-256: 19b6acba975c1e4e9d49277d923e9fcd7a984e67e6cdbaf879fc9b4266217bb7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089feeec7e0c---sabilanuva.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/eabcab7f99461ecb479a8c06fb39342e/vulimawitizudukanogofur.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758458408f1---jifeximigubowedamebubut.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/koberejelurexibex.pdf
    • http://www.gamylai.vn/uploads/files/62891319510.pdf
    • https://gdaniec.com/upload/files/97063445070.pdf
    • http://splhardware.com/UploadFile/file/2021072720320373499.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2hbapdtuf7e41sh5t5qaj50va2/xudiduwuziju.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a1b56752---76913732581.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b92d188cb---30982727167.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/480512656.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d988978e---68899179784.pdf
    • http://navigator-33.ru/media/file/41901820576.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922106c54b6---siruderomusovuza.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7933529adb---64121363132.pdf
    • http://thangmayedex.com/webroot/img/files/tekokiwelesejoxirenozilu.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/76562146179.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608931496f468---77377456295.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/69186921320.pdf
    • http://talleresjpg.es/img/file/37881706444.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/236b754b6f9871229c9b2956ca6580d8/2202546116.pdf
    • https://bursakaynak.com/userfiles/file/86655409150.pdf
    • http://cokhixnktientien.com/Images_upload/files/78912258003.pdf
    • http://yacpa.org/yacpafiles/file/tesurosibe.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6a0c6fc59b0be84aa2e45067a7a70a80/41070493633.pdf
    • https://abofahed.com/userfiles/file/42212981221.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6e2ae19b24cf32105038f6530cc2150c/81262208345.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/r81e36tphlj92m0qdgp96gi3o5/wuziwugusimatepepej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ielts+listening+vocabulary+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
font_01_sfnt_off000105d9.bin
07b896cd9f4163d68aa685ab1e6f97c975d321a567f6059ecba8c03374a24b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 11164 bytes
font_02_sfnt_off00011fb5.bin
493bc9f333c7f89a37748e8e12e779575a69aff2fc483c7557767e5cd9684d12
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 27972 bytes