Malicious PDF — malware analysis report

Static analysis result for SHA-256 958f286f5d58c4b6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 12:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e7ae134871d7ff62c117e78d9ae72784 SHA-1: 94bb91c78f031c1b6e65daaea997e4623e698270 SHA-256: 958f286f5d58c4b69db72bc3b393b557c35a6d6ac851dc9656c51f101c43e496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://laborke.ru/uplcv?utm_term=configurar+apn+claro+chile PDF link annotation
    • http://radio-salsa.com/php/rs/filesupload/file/29266062655.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/vijexogufuwutorepelusale.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/subof.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133348a5d9e3---70176385652.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/98606283060.pdfIn PDF document text
    • http://aimic.com/userfiles/file/28781392506.pdfIn PDF document text
    • http://zl369.net/userfiles/file/vomofawon.pdfIn PDF document text
    • https://j26clean.com/upload/files/kewadapugilibirisu.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/5139643615.pdfIn PDF document text
    • https://robodom.si/files_vsebine/kuzerameleduxanim.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/80404557918.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1b5d82d5---99394762111.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/zagejufikarasekiweda.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/wanujumeregalenazis.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/45896793715.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/87658574688.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5r4sk0lf6hh5j9kqhfqdl0lrk3/vuwani.pdfIn PDF document text
    • http://le383.com/uploads/files/xofudamomalapa.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-2/20210902134837836575.pdfIn PDF document text
    • https://costarica4d.com/contents/files/furupemedis.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/19980588690.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bolevejugubagij.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/70707432524.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 10624 bytes
SHA-256: 2a70d7b8598cdfa8c428503f1bb2f752e9457008df1f0038d4fbfcb1d89b43dd
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 19052 bytes
SHA-256: b016a6f9049f1935a95e2e96e47bc1b19a0bf182a1bfd1fcd44ca1d177e5fb1d
font_02_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1