Malicious PDF — malware analysis report

Static analysis result for SHA-256 2570563a52730839…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 19:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 878593e177b0f796377897f1c58edc1b SHA-1: 18fc9753573bc7baa7eb81130d5b59d478cb3673 SHA-256: 2570563a527308397767abde39198300a8dff7d394fd2a55c420c146db3cd9b3
156 Risk Score

Malware Insights

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

The PDF contains a high number of links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. This suggests a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://szolnokepul.hu/userfiles/file/lenugakixuj.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/59b587cf3735005b99a0f2437fa2fe19/moliguxa.pdf
    • http://pelesiuvalymas.lt/i/File/rikerurux.pdf
    • http://bharatandcompany.in/ckfinder/userfiles/files/2923206226.pdf
    • https://tidaksusah.com/contents//files/vijorilamigobewidodarif.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/konizalinovupivowuzakov.pdf
    • http://eaas-journal.org/survey/userfiles/files/28489454051.pdf
    • http://travelshops.pl/userfiles/file/37398719286.pdf
    • https://dbhattacharjee.com/ckfinder/userfiles/files/pukesejesuzefizuporixoso.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8377cf554---52788161111.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e6c8eb33---71687658511.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab301d1250f---neferid.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a5649f53---tipav.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/14401467757.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3ae46863a---vazuporewuninobenuxetusok.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/90211466413.pdf
    • https://srmhomes.com/images/bulk_images/files/62441723056.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6509c60f9---fatokekarijabo.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c3596d661---1360597178.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0dd2f6d5df54a7b3772ea059091ae2ce/68922038761.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd20b897d---12982739239.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/muxuwidebewuraj.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b27043bae8be974c307f92547a76c1ed/25543397370.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=braun+irt+4520+thermometer+user+manual
    • 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_off0000e0d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 16792 bytes
font_01_sfnt_off0000f8eb.bin
16628a153cac42cb7a0aa821f03ec9d02d7e9e7b00580cd2e2e6371663fc1cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 10980 bytes
font_02_sfnt_off0001125e.bin
1a06b90df8c466d7eacbcede7f702b24a4e0490fc52d1426b58699793e654a29
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 19588 bytes