Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cfda9dde1efcf2…

MALICIOUS

PDF

77.2 KB Created: 2021-08-10 13:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e4b073007993726fe3ddd22ccc471d8 SHA-1: 1a5230587e0ca2cb965f9c0770fb334c09dbb7d9 SHA-256: 24cfda9dde1efcf233ef5bd7d685d120a417d36d227cdc08428dbf66672515a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://simon-daulte.com/ckfinder/userfiles/files/baxutu.pdf
    • http://hani-bee.com/userfiles/files/34689251787.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3efa291c2c---18112734375.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/52847650718.pdf
    • http://beepost.vn/upload/userfiles/files/kagusapeje.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b74c660a---vawuzijonepipifelotirikuv.pdf
    • http://sartor.ru/upload/files/61903646805.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610a845ed929a---11427657966.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/25191218929.pdf
    • http://parkhighclassof60.com/clients/871169/File/vujogokazurajutifugubak.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b823fe99b74---tiredoredo.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/379csino62ou278rs153svb4no/39661434038.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/690a4f4d82aad7494bd0fbf035bf4ed6/dawuravakifigipixugegar.pdf
    • https://stiff.pl/ckfinder/userfiles/files/41573499596.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e63cede600f---42736207651.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d741b5c20---63666341738.pdf
    • https://nstyapi.com/resimler/files/8597145986.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/dd744417aa7bffd9f09f1047a417f0fd/96889014855.pdf
    • http://smartwealthhk.com/userfiles/97372422775.pdf
    • http://parethumukalchurch.com/uploads/file/wowiwosomaseb.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/wedufumivajevibusi.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/48027540832.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf1d8d8ee---merovusoxaki.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609105d7daf8e---33130798925.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e5a9e70491cdb7b1880bf489bc0e7967/rimutuwifewupotikibazosan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=el+gran+grimorio
    • 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_off0000ccd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 16792 bytes
font_01_sfnt_off0000e4eb.bin
40d473f49ed15f727f6052389194ad7080004927aea5d8103e4ebab886f505b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 16948 bytes
font_02_sfnt_off00010fdb.bin
52cae5fbf742be7d8be50ae5824c7d139db2cafb1f71aef7cd6e1e8e947827b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 10036 bytes