Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f3e9981c95fc32…

MALICIOUS

PDF

126.5 KB Created: 2021-09-03 19:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b7342709a6bb8b9fbd552345ae699e3 SHA-1: 7dbdd6c35f637267e447cac7a95bd5b8945e70e8 SHA-256: 77f3e9981c95fc323841a1d1c85450886a57be83a55b2ff4b32fdba070cf0063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier output of 0.998 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://ketchas.ru/uplcv?utm_term=poesia+coral+patria+escuela+y+familia+pdf PDF link annotation
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/9nv2eaog4qnfqo5kt8vi9pl9iv/batuzupatexovunumadasuma.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/mijasu.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/doganomexeputikumudaj.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/69675405648.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907215235a3---61967579691.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/49f5e66aa1d72c7bd36b04df2318f341/muziwofusafazemowa.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160848ea328580---33654454244.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/solaguduj.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kewonegezokuzebuxovu.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/pufor.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/24010038724.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0727348dad264a3b98e867092de87659/42043851717.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hgcjmnnc7d5bt9jpvtdfl3ghk6/1490941834.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087766b96e20---59880883747.pdfIn PDF document text
    • http://agro-partner.com/Image/files/79703558051.pdfIn PDF document text
    • http://tele-video.ru/upload/files/97587553344.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5f763fd8---gonosaxusajoluwebuv.pdfIn PDF document text
    • https://virker-ikke.dk/files/tavarajemiluxexire.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/3041081771.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/mexubezemetipitamod.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/fanusivi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161216f7e82e94---repotemojezujobatuwuzezi.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/34658632808.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c05a0c25f---munafiwipajufoxe.pdfIn PDF document text
    • http://falerisztika.hu/tmp/temido.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000185ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DBE 20804 bytes
SHA-256: 54b1f6e02419be5c8e0609e29444b02737161bc6e8865381b332e3948840b192
font_02_sfnt_off0001d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D23B 10892 bytes
SHA-256: 88d27289d073071a92cfc70e9be9c693c9708f06081f835a6641fa0093e5500d

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