Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e4a7380816330f…

MALICIOUS

PDF

83.5 KB Created: 2021-07-12 17:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ae5b8b0ce31677a756c17292fd19dbe SHA-1: 944ee9bb7a17e2b3952baa150acbb995aec18c68 SHA-256: 83e4a7380816330f9739c679841db6106b59d4c5cdeec0802f0f5823caa78fc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/c45ot5e8r64pst2a8skdi0o1j5/72843553550.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/senekuwudavaramenu.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/17567042804.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d3eb50144---43112213206.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/685c763b728544a3429e086c8eb5e8af/rojegirorukigizemokulirom.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d90d77661---pibelamivimezut.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd468b6c6---visoxumavarodisedajiz.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b74ee13cd53---79769270390.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/38b8554ddace76363ec4d2c6a2f4f5c4/28150430587.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/89888738284.pdf
    • https://doktor-ara.com/userfiles/files/dilejijij.pdf
    • http://braciszewska-klimek.pl/fck_files/file/52372169558.pdf
    • http://wxjsyd.com/userfiles/files/69292106986.pdf
    • https://areicon.com/images/file/89468221927.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/67607118749.pdf
    • http://archimax.ch/dynamic-images/cms/file/jubidumaga.pdf
    • http://ciaooo.ru/uploades/userfiles/file/giveparali.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c34e6e06---73190458991.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0b469246d8a3f70733774fb1e42d8c0/pojedidiluv.pdf
    • https://anukulagrotech.com/ci/userfiles/files/72769671954.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079b09245bfe---kewasakifikelobido.pdf
    • http://botosani.ro/img/uploads/file/xupeva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nutritional+value+book+pdf
    • 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_off0000e5b8.bin
03535a2b70937210354bcddfd0013e0fd2522cca0a7ca48e5d0dfad0bb41503b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10700 bytes
font_01_sfnt_off0000fe26.bin
247edadba87e1045894775366e2358dc862bb01177ac3f379bcad879202a7392
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 16800 bytes
font_02_sfnt_off000129f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 16792 bytes