Malicious PDF — malware analysis report

Static analysis result for SHA-256 df06843bd5ea7e7e…

MALICIOUS

PDF

99.1 KB Created: 2021-08-11 13:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3cf8e7bff5045c85bbdec4d1c9626763 SHA-1: bb271ebe8f0554ecdc76a594ca840017faad5fd8 SHA-256: df06843bd5ea7e7e09f86b599a0d39d3023c91ef48f2a9da6bab6e6ef1b93ac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute further malicious payloads. The presence of external URIs and the nature of the link farm suggest an attempt to trick users into downloading files from untrusted sources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agcslohian.com/userfiles/file/49034746413.pdf In PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/rizirajixowefurerim.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3138c8282---25408732125.pdfIn PDF document text
    • https://arerp.kr/data/file///25693636241.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16083f497917d0---kavifejixepi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c49c219793a16d869898c64f942ea39d/tezegu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071114fc2e31---pimegapaj.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87b09ee05---vizatepixokixujubexobir.pdfIn PDF document text
    • https://tavio.ru/files/file/12372960616.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fc4106902a93751302327ff60b7c24ee/8141409924.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b73db7943---53704197730.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/66419496760afd10ba7b11.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0540a533b6---77309408616.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c56906562---28764608906.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/79539736885.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/70164997134.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///lefifadapaz.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/ramesirotume.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/uudcbi6kpigus8uoldom07sf8m/94029770402.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/21268016229.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/89126966059.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/kofigopekorurevikezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=plato+apology+pdf+grubePDF link annotation
    • 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_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 19704 bytes
SHA-256: b91fed4a679c34608916a0e77f8d9c64c3be692c7a25695940ed98c3ee84572d
font_01_sfnt_off00014edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F2 10664 bytes
SHA-256: 0c310dc90b31f380569f39c3634601b6775a9dfa8e11376b27f05a901e958d30

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