Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f26fd75df64433…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 10:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4865d5f222dcb7a4b19452042c47c846 SHA-1: a22bee2b6791d784c14293de2d991172b65c6abb SHA-256: b0f26fd75df644330672a30398aebbaa6f998e754b868cc9660cad3f59d1230a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fe03466e---zuluvuwenuxiz.pdf In PDF document text
    • http://mibenjamin.com/userfiles/file/89321965097.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/393744394.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/73374404357.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/menejizuziketobegegafekuw.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/demupepigogavagexufexero.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-13/20210913021327144697.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/fimunejisira.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/74811718663.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jutawixuxexametova.pdfIn PDF document text
    • http://agama-rc.com/upload/files/38575776931.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161459a67b64a8---98788429143.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/53272945587.pdfIn PDF document text
    • https://pcetravel.com/files/file/zawelibelazoxunowa.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/fulibojakutebosiju.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/97700628419.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bada2ef122---fupet.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/2165040727.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/86074695706.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/96540752561.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613378a955880---wawelokokofokeb.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/6617663913.pdfIn PDF document text
    • https://inarsindbari.org/uploads/saxevopoda.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135999584b93---jejujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=better+cleaner+apkPDF 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_off0000ba08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 18448 bytes
SHA-256: 4a1fa98411e06540e46340d8cf228e420d849e6230fe7bc37991e8af495a6991
font_01_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 10132 bytes
SHA-256: 54508aee4e979b86529b1efc65e37c8177bf610ed750f66c8956627ed2c62fda
font_02_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1