Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afcade2d52864a9…

MALICIOUS

PDF

96.9 KB Created: 2021-07-16 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 799282dc9754673b9e7315dc053fa425 SHA-1: 51d39962d80a9855805072f397b34db6c2c4e2b6 SHA-256: 6afcade2d52864a99a83991543acc4f22c29902fbdecb49249b5518e50724425
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's used for phishing or distributing further malware. The PDF structure and embedded links are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609269495385d---54579377233.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6550e737bf---7411312123.pdfIn PDF document text
    • https://cape-electronics.com/media/file/megotomavi.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/25183150473.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/178dd22q86tbolnjstfsglc6mr/demizodezazerikidele.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7d6f6d2dab40a27ea26dfe1daf957388/87463556991.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e79e457f7a6ae79c5a646f908836ed7c/finizowiredop.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/30960889005.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48e4635a9e---72116746665.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab01861506---34013700369.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/gamulivi.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/97152711557.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e9293c236d7017f5cbe3f76c30e23c94/mibikeno.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9182b629cc---9919072445.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3f0418a3---98100464941.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/25586413783.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kotivefegevareko.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/wopawefebuxivalokudaxigat.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1094c03b66---dopejofufafi.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/55832180525.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdea0d7b11---boloniravum.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/kixipotefewuwimukebabe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a9c24e1e8b22d283a625a00dac8bc637/defomurinibezon.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/xugotumajelatagadibav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fiedler%27s+contingency+theory+examplesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 11188 bytes
SHA-256: aa3452af1f4749262d55911e66a55ae12fc78bdc44955795238d887ebaa48f11
font_02_sfnt_off00014b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B12 16604 bytes
SHA-256: 5e554272923c46291664e254e3a81f0839d15c71cf979cf6224501ed8a19cb75