Malicious PDF — malware analysis report

Static analysis result for SHA-256 4651d6559464d48c…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 01:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 32c7e57a767c934a332a77f4c33e2b8b SHA-1: 0027b0e41c54beefddebc2a1f6f65b782dedee5d SHA-256: 4651d6559464d48cccd83c50ea37ddd822cc3881650c078ef78bc8945411e7cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content or phishing pages. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd5b249b5---xamowoladomomokikef.pdf In PDF document text
    • http://mail-ex.net/userfiles/file/difetej.pdfIn PDF document text
    • http://slsnn.ru/content/file/34497339929.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/efe2718279c505241e68e9f6890f1f22/fojuzepawopavol.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80fdd443b---96642020836.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a26b4001006---49494080700.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/75169882374.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e5seg7nkg6lruige566q90uhf/kinitawidifalawunitu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/lajak.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc336266c---16118199904.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3130543d22---gapedifaxaf.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4f40b0d9---vujunijadadina.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751462d4679---89956730980.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/7703297013.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7b52fdb2eca0a1cac3cee4af2176e87a/tabawegesilo.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/guxugo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c1e40b235653dbe2a11e43fe9d79960f/28908422246.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3576c6f9953089742fc2cb99dd963460/49130511896.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/113df42cf7209b615f4c2df0ec6d0c13/zipijelove.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c49a55ea---gagerizabafam.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c7083e0acb17bb9dfa5f2be4b8e00067/semesis.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98ba2a6a2---wuwirevugikaruv.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/42279542962.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wisegapovozutupukaguv.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/poban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=postdoc+natural+product+chemistryPDF 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_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 17628 bytes
SHA-256: 929bfc24c151b33ed18dc1b7c37213defbdb553e1a38d63565ab5656f91941ba
font_02_sfnt_off0001351c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351C 10992 bytes
SHA-256: ed1c531672c2e41f3e16e13ad3a162a7051bac7ad120cdcc85fb9dbe4bf34f08