Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa7114a65730534…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 14:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ae88049c1f7f4e26f2bedd137a36bf5 SHA-1: f654ef3042cb324d5802dad5d0abf8d52a455075 SHA-256: eaa7114a657305340be66805310b29345133e688043b70128ac3fdcefd190a44
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4b2e0094---gajivur.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3a5a5b491---duwojetew.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/087e3067d05561c78730cd5415f22632/10207462577.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0b416d49b---navofupilepatexuzuxubi.pdf
    • https://xlspandoek.nl/userfiles/file/mezifudalanavonopikud.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c2a45acb---maxugufujavufesebegopitu.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ee4d22598b664dd011ed216384d3fdb7/63797289399.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/igenbdtnns19ajrmo87g50q8ep/botix.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737fc0ac8f9---28144283892.pdf
    • http://www.allatpatikapecs.hu/images/file/44640465599.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de0946691---bipaxikafomagozopuwikasus.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082550783d44---kefuvizenodilerabutujewaj.pdf
    • http://progfin.pl/userfiles/file/pusofotaxejabumeta.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a1eec004509d34c301af3eb83836cde5/95744452906.pdf
    • http://hoangduy.vn/vn/files/19209313756.pdf
    • http://chrislahoda.ca/userfiles/file/93299353292.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085789474a78---18910947150.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/00c254561e642bb1d743c98394cd45a4/98356476903.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1972102b---40317510666.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/49014590440.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9af52ba7e13a436a2f17fd964e562ace/60956633698.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8jur99qbt6f5941vetf4emvp72/sozerugiwixino.pdf
    • http://onishi-kyosendo.jp/archive/tuxavajes.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091e616b2319---7711689331.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+word+to+pdf+in+mobile
    • 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_off0000ece7.bin
69a8ca92d81b40c770de246bb2fad2754009e42a218a0304b04d624e91c75c77
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 17668 bytes
font_01_sfnt_off00011b16.bin
401b868849a7c8c7dfdd5f9d1032257ff20d5bc07c688ff60991965db19be0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 11116 bytes
font_02_sfnt_off00013461.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 16792 bytes