Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3e361b87c8f069…

MALICIOUS

PDF

78.6 KB Created: 2021-08-29 10:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a448cfc26da39c2e7497e8b32eff3bfc SHA-1: 0a96ed65e64b1d24f00e80c67690a0368a90481d SHA-256: 4e3e361b87c8f069556533cdca9f67849fd133341e03707704f3fc43652d5451
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further indicates malicious intent. The document body is heavily obfuscated and unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=lease+renewal+letter+with+rent+increase PDF link annotation
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd7db6422d---84706688248.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7b61df8274ad02fe29acf31bc9dde893/89455108466.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/kisudizidofuz.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a253e1f8e---30233377482.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7164fd65a7---sefabimifumusulumaratune.pdfPDF link annotation
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e968b9d30c---63755568698.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9884914a58e2643550100ade52392c0a/75761499558.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077adcabe174---57186455105.pdfIn PDF document text
    • https://purefeeling8.com/data/file/158127521.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zabisimegixe.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8875a5a32c---jewupumiv.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/32863229795.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3fred5hrke2flbsu1chlo7958m/vatobibuvologi.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/wejigilijijib.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59af39d8c---89638790454.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/p0pi309oln88a0vjpl9htji7ri/zabonitoteke.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df09cb2ca48---nebuzido.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd02e73a31---61339902368.pdfIn PDF document text
    • https://atrax.hr/files/wikaguwuxixaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4e44724a---toguzasupofipaxetabisif.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f08fa2982---zawitamimata.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0k1v26hih40tnm875j1d1bf65h/benekaxosifuxakojut.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/kinufalogujiborazedafiz.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zatisavedibeniva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 10252 bytes
SHA-256: c5ac5302875293bf85c3b5e517b5cd19147eae99a8576b0ff34613730fbbf1bf
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 17420 bytes
SHA-256: 90753060531f92c4c3c0e35aff063d06f64dc4f3693ba458bf9465669fbb7f07
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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