Malicious PDF — malware analysis report

Static analysis result for SHA-256 9857954827a8879d…

MALICIOUS

PDF

82.2 KB Created: 2021-10-10 03:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 426cfce6af5a0ae456a3bd4cf9030afb SHA-1: 703e58e3c60ce2253d7fa6ca123b3c49897bae31 SHA-256: 9857954827a8879d0bd7a840636553f58a594baac7ccfa680ef695fe94c50633
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains flagged as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure as a link farm suggests an attempt to leverage SEO or redirect users to malicious sites.

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://abwhopewell.com/uploads/files/safute.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381062d2128---gavilapanimazi.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/39694050633.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/72737357403.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/9101366779.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea6ccc041d---44709511183.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20211002192520.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vfed0iuerq0etervhgdacvk247/6277131036.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219252210597907.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/3784638097.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/49926201985.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/91634964306.pdfIn PDF document text
    • http://saimiri.name/upload/file/69494361593.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/61392372449.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/64831462224.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/67358032817.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/66161840370.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/nuvunurozepizaxefiji.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/semosakijuge.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/45944388483.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jifiri.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/91276437605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=caars+conners+adult+adhd+rating+scalesPDF 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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 18640 bytes
SHA-256: 618d37c05b9741543a9f914ff9ceddfe7f760eda1e4a93e39258cabd67c61462
font_02_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 10780 bytes
SHA-256: 5d60cccd1856bc2430c4a3e0e47eba657f19976193a968cb46a8c91a24432f0f