Malicious PDF — malware analysis report

Static analysis result for SHA-256 22200d389d421c51…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 13:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7662eba3a4b236f0edc7a081fa91785 SHA-1: 55920b22c363eaebc246ece17cb3e33a9cc65f9f SHA-256: 22200d389d421c51a15601d28fbad75d16a9f33e3101abd60646cc0b72606d14
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 directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dd949ed16f7---49456876685.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/53716556142.pdf
    • http://goldmustang.com/files/files/kudumelalojosonakefuta.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qdter6hk4p651ks3m01maj1mjd/lonabijagoxojimo.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vh970vlvbfgsa3cei4kieqhtec/vuxikokakidabujubifuvojev.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608196065837e---pomotag.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/tejom.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/14377206917.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dea4652a3---47311450093.pdf
    • https://accuratesearch.com/userfiles/file/66398674211.pdf
    • http://flygarfield.net/userfiles/file/vegutiv.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1ebcbbc01---83698274254.pdf
    • https://twr1115.net/files/fckeditor/file/makukevedilajasopedugeba.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vsbknlftv383b1m04coubr2h01/92021647201.pdf
    • http://schodylux.pl/userfiles/file/63162584270.pdf
    • http://bhs-class1957.com/clients/35434/File/dapiven.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086949b8e5c1---wesowenelagazamigi.pdf
    • http://norilskgu.ru/userfiles/file/32347361171.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/f6b2ga7ptd0qsotn2pl5o7grdk/wapenut.pdf
    • https://theatresaucinema.fr/uploads/file/mavopetegisizutidomolux.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609845246409b---mibovozuxoko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=spider+plants+and+cats
    • 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_off0000e8fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
font_01_sfnt_off00010113.bin
83449988478260aafec297cfdf064ce7e87f49d9e82ae7f67eaf9ad0eba8968d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 10464 bytes
font_02_sfnt_off000118e2.bin
be1b76030308e3a588af66c0e49a705a24482a934d58d4d94b0822df41732872
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 17352 bytes