Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c8df1f6400abf7…

MALICIOUS

PDF

89.8 KB Created: 2021-08-19 06:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78a91ebda8e91ee1c3263326d6861ecc SHA-1: f758b013177e3de3e85a65944d98e8e6f38c9379 SHA-256: 42c8df1f6400abf7c3a84cff310335cb4b96c75a59f69c104a9899f9747f72b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many pointing to compromised WordPress sites and other potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/10c26a1e439da6e254569f425f6ac190/dekovali.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/12a92844b0279403650a001621076a48/nosop.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ed81d5be32d9ee81a0b225bcdbfef653/97512395693.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/nidigusebepitarubani.pdfIn PDF document text
    • https://isosklo.cz/uploads/23984205269.pdfIn PDF document text
    • http://hkacca.com/userfiles/76947505798.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c916085---43182296165.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/woxidamobixolagi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a29a7cad---napowaw.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/pibaguwuragumufiminadar.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kujedilogajukalogizebolin.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/bazulaz.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/43a4eb7f16c1f8e2119b04a5b5a248bf/60996927735.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/3345389284.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1625291564.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9ae2ce4f3e9048ce73f5c2b98c1637dc/lanekimesiwolerunu.pdfIn PDF document text
    • http://unseretochter.com/images/file/pufinenaj.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/risamorimiper.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d708a75367ee9e8a83b7724254f917ef/wanujesajube.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/esvnnp49isbvp8nmiinh67cnq7/kazogogali.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/45621771217.pdfIn PDF document text
    • http://splogservice.ru/content/file/zelozidof.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/71110928168.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/16499030198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=payback+period+questions+pdfPDF 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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 11160 bytes
SHA-256: 94e6421f28fe89842a119ca5a72bcb4a4bdbec77ca33ffab22bcf5f15ace55a5
font_01_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 17128 bytes
SHA-256: 6920bbbc93a06b524090837c127a75ed1c2868d5ebbb4859ee3cc181d9bd9a83
font_02_sfnt_off00013f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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