Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5a2935ee19f1e8…

MALICIOUS

PDF

92.1 KB Created: 2021-06-27 16:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d7df5a4a8f543ca6f5f925ecdda548f SHA-1: b8a664568282ba41ddea80ed10fa287644bac179 SHA-256: bc5a2935ee19f1e855e78c76f21ef5380acc85836cbfa052b3f4c391fc48c98e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The presence of these links suggests an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/xilulelipuzimater.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ed0062fa61afd99386f9dd3bc5beb0ff/78340626921.pdf
    • https://suma.ca/upload/editor/file/lisosabafenaju.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ltv13tuggs1n61jvgpu0qhf5pp/ruvibikalodawerikiw.pdf
    • http://royalgoodviewresort.com/Uploads/file/65319740077.pdf
    • https://ntct.dz/ckfinder/userfiles/files/nujepev.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b9c3778c---99671815549.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b990ad11913bcc85698ebecd8589e357/zijiga.pdf
    • http://aqbnb.com/uploadfile/file/walakewogivi.pdf
    • http://iltorg.ru/upload/file/54105923045.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a54e1a44---88387049084.pdf
    • http://soft-pro.hr/upload/datoteke/99328898274.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6salpva2ua8rdtuqo4ctlrp240/73614705582.pdf
    • http://boathousebrokerage.com/userfiles/file/70096268985.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eac7f1887d---55194841216.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/tph1gf80gneucbadv7g5jbpvn0/64238205615.pdf
    • https://decoveinvestment.com/userfiles/file/36438920678.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608714f31de38---majulerodijis.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080675742675---10848959467.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65aaebb57---vivezipijemenavipekeve.pdf
    • https://ph2020.org/FCKeditor/file/lunapuxifiwole.pdf
    • http://jucal.es/images/file/79500628565.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160709046582b1---wurejomeveso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=our+discovery+island+4+teacher%27s+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df07.bin
4c840faf034cc7ff86a14f6e58b5ea637f00fcb1aa2aee4702fdc2076cee1cae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 28564 bytes
font_01_sfnt_off00011853.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16792 bytes
font_02_sfnt_off0001306a.bin
2ddd673deaa667efdfc8dc5fdc716e1586916afd9d15de21d0c7bf6563d8fc6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 11368 bytes
font_03_sfnt_off00014b09.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B09 16144 bytes