Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2bbe96d7d9eca4…

MALICIOUS

PDF

86.2 KB Created: 2021-07-10 07:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11f36eb04230b697b0f722b1e5c2c3f5 SHA-1: 33a1f660fc648cebb15ae0e9fa53599ec08cae01 SHA-256: 8b2bbe96d7d9eca437786ccdae53a8f1269bef429b4fd860bf62dcf9ff50e1ef
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of an advance-fee scam, including language related to lotteries, prizes, and parcel deliveries. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The ML classifier strongly indicated maliciousness, and ClamAV detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ray-king67reunion.com/clients/41562/File/muzakukivivuveragukif.pdf
    • http://airfa.it/userfiles/file/80350493217.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a0127051e---21446384264.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26da5ecfdd---73577372119.pdf
    • http://alemotta.com/resources/original/file/xevujeju.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/qub6rhfd6k8op65o42fj8bat49/wupug.pdf
    • http://buddhavehicle.com/userfiles/file/28456799180.pdf
    • http://papinchess.ru/userfiles/file/kulewuvagirexokas.pdf
    • http://euro-ex.net/images/blog//file/13169132434.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b6848064---pidaweladilusumunuret.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bee49c6a0ab---50106177778.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bec5f5927e892dd67c6f4d604755417b/38762130783.pdf
    • http://v-lukomorie.com/uploader/files/86199214359.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcaec23c410f474c4ea0fabb657e49ad/90504669655.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b339e46d0654ec7182d17e3e4f6cb276/13528917578.pdf
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210701223732.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecf9a734c9304cf7c9f204d6c498b704/raroropum.pdf
    • http://turinhotelcompany.com/userfiles/files/53721322872.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ddd531721a8f8d0c67b2dccd9d535506/zokefegugexerurago.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b374c819db5---10014829301.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+cite+a+picture+on+powerpoint
    • 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_off0000efbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
font_01_sfnt_off000107d3.bin
301fcf4aee90550e5854e5d2bf98d62f009375eba04dbfae5afe97a696b64265
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10332 bytes
font_02_sfnt_off00011f43.bin
850546c0039193bba932e8e0327fd50266186a8c9ba793f9c5d3f7824143cbb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 17052 bytes