Malicious PDF — malware analysis report

Static analysis result for SHA-256 818ed94801a2a368…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 10:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70d579d80665f856dcb22897df8d94d7 SHA-1: 5374f148a61d43585a5eab3cdc5af00195f079d6 SHA-256: 818ed94801a2a368cd4ebb9a6884a7366724366c85ced274940275ebfb5a2cc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, indicating a likely phishing or redirection scheme. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zilalcooling.com/other_files/File/32409828950.pdf
    • http://accapierre.it/userfiles/files/92073343098.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a02b1a04---27098408510.pdf
    • https://radmangroup-ye.com/rgfiles/file/49471303233.pdf
    • http://dj-maily.com/uploads/pages/files/91956145028.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141215e7bb9a---voporagekide.pdf
    • http://newkontakt.ru/userfiles/images/file/vitetefoduxuwa.pdf
    • https://dalba.net/other_files/File/sulodidepexokolizisulusi.pdf
    • https://ismart99.net/upload/files/dapipubolexivomumevu.pdf
    • http://navigator-nsk.ru/userfiles/file/galovokugazodinaxid.pdf
    • https://cleaner.pl/userfiles/file/farefogisufu.pdf
    • https://warungmimpishio2.com/contents/files/52006633554.pdf
    • http://pobierzplik.pl/uploads/files/juzija.pdf
    • http://sns.hu/_user/file/bopobok.pdf
    • https://sibconsulting.com/contents/files/fodefikizukudowifokutekef.pdf
    • https://queensflower.nl/clientfiles/pozunanagotabowokimaxu.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/45594296381.pdf
    • http://dansecyr.ca/pdf/file/gopibib.pdf
    • http://isdoor.ru/uploads/files/zunop.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/34982884910.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/56073525178.pdf
    • http://architettotamborra.eu/userfiles/files/17283282023.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd28687f6---92202177425.pdf
    • https://olboihorgaszto.hu/editor_up2/jemiwedujij.pdf
    • https://stopserv.ru/files/file/lijavevowol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=8+ball+pool+mod+money+apk
    • 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_off0000df8c.bin
698e986e94ff681574db550f2659ff5368cc788ea180f17e2822876545dcd615
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 10552 bytes
font_01_sfnt_off0000f74e.bin
851023c5ce9318cd0a1a3fe78f04b127c2b7675f95cb8d938c2f4d4649e7ed88
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 18128 bytes
font_02_sfnt_off000125b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes