Malicious PDF — malware analysis report

Static analysis result for SHA-256 2497d7165c82eb61…

MALICIOUS

PDF

84.3 KB Created: 2021-08-15 02:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6828a83657afb3d3fef34e788cdec937 SHA-1: 034146502b6cd2ab1ba5e55ad5df0a9600253252 SHA-256: 2497d7165c82eb61ce6f788aa516d52f2fa26d35966e6ceee886cc6fea02264a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.findvoters.com/userfiles/file/vibobenilaxin.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/tibiwawigedagevidujox.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6c2fa025dbdacdcf401d8f011b1282c4/99219077779.pdf
    • https://danielstrehlau.com/userfiles/file/xologefogonelokipelitix.pdf
    • http://jeyadhurgatemple.com/userfiles/file/55288173867.pdf
    • http://sisparts.pl/zdjecia/fck/file/demilozokok.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160897ed07cefd---36630870082.pdf
    • http://harchovyk.com/userfiles/file/45869385590.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/lapemusebave.pdf
    • http://aranykoronakft.hu/userfiles/file/38153362598.pdf
    • http://tulga.ru/editor/files/bedavebidifelu.pdf
    • http://botosani.ro/img/uploads/file/baganugiwow.pdf
    • http://trustarshida.co/cache/fck_files/file/zedapuwewi.pdf
    • https://alarouba.com/ckfinder/userfiles/files/30195943986.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100af67969d9---tisetefemonenolovivami.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b968d34c830---tewaribaz.pdf
    • http://dok-vo.ru/userfiles/file/wogusenasubuwazevipiwow.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082285fd72c3---72599219599.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/70075800727.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50bff8fa82---tibaxuvorifanubaderade.pdf
    • http://polyalpan.hu/_user/file/94928900546.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/worobipipudig.pdf
    • https://istanajpdua.com/contents//files/pores.pdf
    • http://pospatrans.cz/UserFiles/File/17025046387.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=caminando+entre+tumbas+pelicula+trailer
    • 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_off0000e109.bin
9949cc19cbf419abc7d2f12f3041742d7345c3fc7dba350d38699b8dda26393f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 18476 bytes
font_01_sfnt_off00011075.bin
86c3dce4dde96749a94f951903d908b36b604c4f71767af462a01367eeb80f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 10948 bytes
font_02_sfnt_off00012992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 16792 bytes