Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc5a20dfa423abe…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 10:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cb99711299571d9b60039ec452be32c SHA-1: 238b75af5614c8c2f6eb3370cc79a33daedbaac5 SHA-256: 9bc5a20dfa423abeff2c3511a383385cd89c9a0328d44b8a04935ef40b35af6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. The 'SE_INVOICE_LURE' heuristic, combined with the URL containing 'minecraft+java+edition+download+free+in+mobile', suggests a lure to download a fake file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://concilianavarra.com/userfiles/files/64913176564.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144b8930faef---77730537608.pdf
    • https://mintowncoffee.net/uploads/images/files/71257212816.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/71657111556.pdf
    • https://artdecor24.pl/uploads/files/53676867892.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/winularipakigujedar.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/lotibugu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130abc037448---mapixukukebutagutabis.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161371141538e2---69293015698.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/nasukivokugi.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613878c1a8cd0---kuvijagebutoludu.pdf
    • http://mishor-uvk.com/uploads/files/tofezufudod.pdf
    • http://wamaeassociates.com/images/uploads/originals/file/76850640970.pdf
    • https://termoformat.md/img/files/59142600172.pdf
    • http://princeverma.in/uploads/files/mozanusakiwidupikaguvi.pdf
    • http://pm-property.pl/userfiles/file/banijudigediramigukewamod.pdf
    • https://lbk-ingatlan.hu/uploads/file/dediro.pdf
    • https://trompis-tondschungel.de/userfiles/file/39596616254.pdf
    • http://medtravel.pro/images/hand_uploaded/files/45681154974.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/movuji.pdf
    • https://loyd.rs/images/file/nefap.pdf
    • https://swiz.eu/files/editor/14411901730.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/66270784193.pdf
    • https://mogilew.ru/userfiles/file/sujavujulolegiz.pdf
    • http://babijie.com/upload_fck/file/2021-9-22/20210922144606871475.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210910_2B12B26B611978A3.pdf
    • http://camel-republic.com/media/userfiles/files/26460828060.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+java+edition+download+free+in+mobile
    • 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_off0000e8e3.bin
1d283cac93a184fc580ef8bfa97957affab4d12a521982fb8537b0db9edbf81d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 18260 bytes
font_01_sfnt_off00011858.bin
72d2c627497793a76c7716f6e97acd3d2130b56588a2900a9a02bbc6346b7162
pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 10884 bytes
font_02_sfnt_off00013187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes