Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5003f019a5b6c2c…

MALICIOUS

PDF

87.7 KB Created: 2021-07-23 10:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3592eb259dee9f5b3cbff62b1a1ab3f0 SHA-1: 89c92901929065fcf99f8dad9bafaa51f2b59173 SHA-256: a5003f019a5b6c2c858988c361d60cb29f6767e0340fe6ef26bb917a0bf12a00
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://dusunceokulu.net/resimler/files/56614925832.pdf
    • https://travelsafeway.com/userfiles/file/96147546195.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afa83ae6c17---xilusivoxusog.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8r1v5gl2btgf89pfeo6lv8n33d/20487332382.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/29bf807cf44dc97b496dabd74b00f152/xumowufobuxusamas.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd26e9561b---75549779592.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1360879c9---futuwip.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6039e7156---rarabozavejemapufu.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/kukunodedejotozib.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085dda6ef87e---14789297373.pdf
    • http://ggmtc.net/userfiles/files/najilovaxuvoju.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/kuneba.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f114ba6d---nufet.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ec34e6d99---28348330682.pdf
    • http://119pump.net/d/files/nafajixifuselelip.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a940046e402---7906599482.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/49ef9a773bd91a61f21c54c489bd2ccc/22132462530.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f3ddc77c96bcb9c6bb83b5321b07d4bb/6682969105.pdf
    • http://ankamet.com/userfiles/file/61018806562.pdf
    • https://guclupin.com/calisma2/files/uploads/7471496157.pdf
    • http://dges.in/userfiles/file/75544462399.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/oqo8i8j2fge7rcp7gp1teqbp7o/wemivovexujisimutesiz.pdf
    • http://alarmy-kamery24.pl/userfiles/file/disiwir.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d540dcec04a---wibek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+long+does+beer+last+in+a+bottle
    • 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_off0000f4e2.bin
9126dc62b163e5749b8e122c649ff8dec175b19b815ddd1b228c0b7e4010d3cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 10640 bytes
font_01_sfnt_off00010d2a.bin
fc1ead76e66aeb706e1adc0400568c4620396945d8450c345871532c0d86b70f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 17024 bytes
font_02_sfnt_off000138a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 16792 bytes