Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82aab032efd12e3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 10:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ad33bdce18e40d0706efadcace2d0ba SHA-1: 46f58a8094106cfb873482c51aa6c292ac3861fd SHA-256: c82aab032efd12e31a9b25d52fdb404fe6ef307af9dd70c37c243d59a6ab862d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations or disposable domains, a common tactic for distributing phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=app+store+keyword+tool+free PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411912596e6---navudamudux.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/db0c00773a1f31bd3c7b19ca895affdb/duzese.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/rojomiku.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/61399425713.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/31218437709.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/jafawalatuxonepevirase.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23123060753.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/31561505304.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d816f7735e---fapibikekeroduvusalod.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/lumaw.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/24580408212.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/pilagufisonep.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/bulerewegiba.pdfIn PDF document text
    • http://fitviewer.biz/files/file/13856794736.pdfIn PDF document text
    • http://fedime.org/imagenes/92977690566.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/38698725849.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/22912319595.pdfIn PDF document text
    • http://vladekoservis.ru/files/zasizakikobupixigapa.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/38665218166.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/69341617359.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/linefeje.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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 18388 bytes
SHA-256: 9fdf45a0aab4ce276514998aff8c6964ad6e59cc13c6afd1ede2275ed0fd0d6c
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 10404 bytes
SHA-256: 6acc6511dd0cca4dc55d1bae72572a582bb5a134aa836aaec031d9c1af7c115f