Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78821d443ddbe3a…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 09:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d2b4aeb4a9d5b56101774805343fe8e SHA-1: fb53b62ba80554c1debcede8986701e82fc94c80 SHA-256: e78821d443ddbe3a08f3fc59698aa2cb1c6ec9ca2b386bab2e8ff91758712c97
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://okwecare.com/usr/userfiles/files/fimazawezufam.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd261ed31b0---gujopunaraxewenunike.pdf
    • https://vicotelecom.vn/static/source/images/file/tamawifufijulomup.pdf
    • http://www.abcklima.hu//data/editorfile/dozofanalejupi.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870dd88cdff---jozikem.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/30e52ba90b1026eeb5433ecf7c6e453d/39362611522.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nv4ql5liu0j8f6mdl44i8ifjv0/resodulilisusumib.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35226ba57---38622013907.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088348e95eb9---47675935388.pdf
    • http://marta-galan.com/files/varios/file/16251169840.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hhpt3bu0n4780to8c91hf3snv0/90067925463.pdf
    • http://verypool.cn/images/upload/File/86666090918.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c199307228f---60665472546.pdf
    • https://sasalidayanisma.org/uploads/file/gipekewilagoxo.pdf
    • http://51-lq.com/userfiles/file///90398686729.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/557d2d95d4eb23a6678b19972635bd97/doganesaruxokuwimudegew.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/27f0fb7a2a2242807fde0f08b63cabfb/51217378394.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffb06a9cb---pamineguzo.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/42262734959.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d447e07b8121e6eafcbc0bc2c718394b/ralotixerepope.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2ms4pv8dc180i77iq36mripknn/45375920251.pdf
    • http://thicongdiennuocmiennam.com/uploads/files/jigekojaxidaro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hot+sexy+games+for+android
    • 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_off0000f7a3.bin
c3976ae04bcb1db93726ef2c70281e36e76b6e302c405a4ba4ea01e315aa129a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10856 bytes
font_01_sfnt_off00011081.bin
8dad424abfeda545cc36335068a2243e0c687a343511499b401448cfbc8c9905
pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16436 bytes
font_02_sfnt_off00013b50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 16792 bytes