Malicious PDF — malware analysis report

Static analysis result for SHA-256 104543887d8eea01…

MALICIOUS

PDF

95.3 KB Created: 2021-07-01 15:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14846d0b2e5ef4d7dd878a78d7245f5b SHA-1: 39e0d9c213c329cbaa9566c598e2b401dbf203c5 SHA-256: 104543887d8eea01f6e1e977266e35a9114f2e0186e06b0892656427ef6cd81e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dcf61b749---74321091013.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99230ade7---tikojexexiluxekunakijof.pdf
    • http://msinziniering.com/userfiles/file/gemodokinogoremaxiso.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a3b16cc8b---23075756366.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a90cef26f32---xifedategux.pdf
    • http://startmatbaa.com/userfiles/file/68282640384.pdf
    • http://bigsvatcharasith.com/userfiles/file/kemomejasavef.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160827315e701e---47729714383.pdf
    • http://cokhitienvuong.com/uploads/files/guzimawufo.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/c5jrh579nivpuaaam33iunagt7/fokonikam.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084df1ad06ef---73161478976.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lanisinadul.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c4704416---71242433039.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/44q2m6l4bm9retirhq78arp9t3/fifedikigi.pdf
    • http://faradbox.pl/files/file/39383215338.pdf
    • https://dm288.rs/slicice/file/fujasijuvaxusonituxebo.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/753fbdf3c4dd86757e933f4d8ce1764c/jipabadenakonedamefox.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506d3e363b---64198745262.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/dd8e7b6550aa21ebccfd17fd2d379992/17522119290.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a32d8e3e5---towoserijonekigupibano.pdf
    • http://www.bash.cl/media/file/majolefupobixe.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c952321c---5416354725.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/66f1b9f1953fb7281e7a8b30c01c203f/gemeja.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd487181202---2983485326.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=concise+mathematics+class+6+solutions
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd06.bin
bb1548be707e401bb2d73d2bb63cdba51e057e9f536f2db71bd2b8be5117f0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 10696 bytes
font_01_sfnt_off00011566.bin
aa96e709a990aa42975ac5870293e907c6b448438eaacce586b7f8aeb23b1ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 17180 bytes
font_02_sfnt_off000141ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141FF 16792 bytes
font_03_sfnt_off00015a10.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A10 16088 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.