Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe7c38c89dcc6a0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 10:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c2f5941b2adfd13f4ddc5ca254146bb SHA-1: b580252fb59b6a2a9924cc470cdcb5f4a4026b0e SHA-256: 9fe7c38c89dcc6a0eda0b1c4dc25b84e5019c06450913040032443dcf9927082
164 Risk Score

Malware Insights

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

This PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5nf3c58vq411jkk0ksm07cvdls/jadilexidoboxenupiwu.pdf In PDF document text
    • https://helicopterleasingservices.com/userfiles/files/4713184911.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/76606425502.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/wanuzifi.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/14434851181.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/77872719730.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/451d1cf243345d916dcee9418320c057/dakegisireveguwesozexiran.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ra93che3f2cb0r9crpr10hbo20/xinoxajux.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a27c0ed7602347cfa702a062c164d9f6/mokezexugi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2d915646---61531090810.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f25371bbb42---4192208779.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/dijafo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/eb704d9d66f9816caee1443e327ba8bc/72838698083.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/bituruxuvopogitetomal.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3k1jklcs1m0s7ljfbkrjgao267/48368981188.pdfIn PDF document text
    • http://3q1p.com/upload/file/210709215050343752327v081h22l4.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/zunininodazuwalakizi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12aac26ae7---duwamuw.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fbab46975c634a08ae4e930aeca7f963/58369809446.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b273a3b229f---88501672738.pdfIn PDF document text
    • http://guowangcable.com/d/files/sovafukejukajumolenate.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/57138822948.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/27024139495.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/bitamupolemofave.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/57312861772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manual+balance+valvePDF 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_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 19092 bytes
SHA-256: 10da1abdf85a731b31dd1f62e410dcc24ced54cd6d0e4d4fdb83e77ecc4c29db
font_01_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 9944 bytes
SHA-256: 9498913afa319ee705b5c353e8e71a86915172789f49ccbc29157ddaa0fd467b