Malicious PDF — malware analysis report

Static analysis result for SHA-256 821fcb70d9bf3437…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 01:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 050cd8b7a9f0e8a23e93c61a44d1716b SHA-1: 87200c21b0c33221b1369c74fbd0d370a699735c SHA-256: 821fcb70d9bf34373c5cec3f0174eb5c2cf4bcb1934880f07de9a6726fb1a325
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c751942c---16825567061.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/47270110203.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/19371468225.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xomimowuroguminun.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc34b286---fibelanevalufasuvoj.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/wemopasogeliwa.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/97430950518.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/zexowaziwufitu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70ec54cf3---6968093616.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1013c991c---rowugigosivesebelamot.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/17447674974.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/2916160324.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bcdafcff4e18bbca52ea33638cabf921/satenigixuveru.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080df81e25d1---xojabalabajokiwus.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d9ec09a41---siwosudofetagojud.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609445b47705b---javoluvagepeki.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/ginapovotavegufe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e81f17ad---poguzisufilebameluto.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/41965611415.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/bizosufanuwotozibekizore.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/77189484944.pdfIn PDF document text
    • http://yuha.be/_files/file/5077381485.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/43352006693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=your+daily+self+help+program+testPDF 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_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 11036 bytes
SHA-256: d4c144a83a41b1e8e03feb917467184388cc67b0bcae0ba807da6b1bcd838903
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 18240 bytes
SHA-256: 30525cfefb9d9bcbe116a5a3768d70494fcf5953aef254cf12c813a9ba363df1

Open this report in the interactive analyzer, or submit your own file for analysis.