Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ac5ef0641cc35d…

MALICIOUS

PDF

98.4 KB Created: 2021-06-27 17:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc520c1f6e0402424b47c7d94ea880b6 SHA-1: 146854619534a0016e9c55e3b57134774d3411af SHA-256: 78ac5ef0641cc35da465dd5433144f2cface7c817bbbf10cbef09a09e82f45f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. This suggests the primary goal is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ec26118d---12928601065.pdf
    • http://rajskiewakacje.pl/userfiles/file/18247668563.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba793312c---riwigu.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556082c5ff---wuwojifejikolawoz.pdf
    • http://www.aqsclimited.com/EditorImages/file/32297537094.pdf
    • https://abugfreemind.com/userfiles/file/retebebaketeluwitarasak.pdf
    • https://betentour.com/sites/default/files/file/48658868451.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/37lts7cf2ppoh8h8l09ohiieuf/5044159233.pdf
    • http://puginternational.com/ckfinder/userfiles/files/vafufotipewafuvawikupiwul.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d5e1fda7c87fa176be0f22eb4df48874/53763457270.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67ba18781---50123583496.pdf
    • http://www.peretprod.ro/content-images/file/49117258803.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/68226333421.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/60272608232.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16079816e36a3d---63269561249.pdf
    • http://szkolka-wiercioch.pl/files/file/sunorulalo.pdf
    • http://timnhanhonline.com/upload/files/79734215262.pdf
    • http://broorybulldogs.com/clients/33993/File/nopavegolamode.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf49c51b807---jadifimi.pdf
    • http://a-swiss.com/upload/userfiles/file/11699559938.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/176d4ada00ecdc9e42b439778a420320/53105939051.pdf
    • https://airbays.com/userfiles/file/37846212905.pdf
    • https://cupanghitam.com/contents//files/fivakagewosa.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077741689b16---judomelozagekovale.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2052a126---posesupojokenisiwilu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=shannon+index+definition
    • 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_off0001070f.bin
3d5ea7321f0f2be8f5d51bcc352d1a575c18e387f1fd629867a290afbfda7dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 10312 bytes
font_01_sfnt_off00011e43.bin
1fa0c322f666b1c5da6aa0758fb0e8f4504098ec8b4282444625868a4a6faadb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 17980 bytes
font_02_sfnt_off00014dfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFB 16792 bytes
font_03_sfnt_off0001660c.bin
919f1bc367624d721b2fb31ab12125a2b73dd255637d65187c7543b9c3013291
pdf-font-stream PDF embedded font (sfnt) at offset 0x1660C 16224 bytes