Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfceff430e589a0…

MALICIOUS

PDF

82.0 KB Created: 2021-08-23 17:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 509511a249ea018b14633287987a5649 SHA-1: 0db7549470e844fc47c3661eb967742c33b6349a SHA-256: 6bfceff430e589a0c54b4437991408fc43f0a4d5be36f8e129fd68d0f0987a5e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://autosaloncenter.com/uploads/file/padenenametexowubofun.pdf In PDF document text
    • https://wegofa.com/userfiles/file/jafewutuxebivodozel.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a4febd681---76956280151.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/63356218995.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zavazuwiburozaf.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/66441169885.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/guwuvazibudomitakisok.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/26996166447.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/gerodutojevini.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/23261074605.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/pijabedisag.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/57831309910.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb446ddde---58251702986.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c731ae1575---20153958819.pdfIn PDF document text
    • https://aneri12.cz/res/file/gawamemofixafedur.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f53d524ebff---milidabidowuxa.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/sopujudufixepurubufemib.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/pozanovowafubevenifetit.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/50581438090.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/mukurabulik.pdfIn PDF document text
    • http://agrion.org/upload/fichier/goroxugobofesetamufitulib.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/xugedamerita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=paraphrase+the+followingPDF 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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16824 bytes
SHA-256: d9a96257462d93931230f1de0f7dadb81e86b1d0d6f7c99fe86cc6c48534397a
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 10724 bytes
SHA-256: a729f36cb65713d7e07398ce88f259b0da34805d482e4874f6559d579407b1a5