Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ba235a810f9d9b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 01:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bccb3882b2c235ebae574eb00b61b6ee SHA-1: 5e5c4e5b8a1d8a29723b8ae2c11afcbf6d222e8a SHA-256: f6ba235a810f9d9b6f23cbb3587ecb2985fb54440c1c5c6aa24aee45b40b08f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests that some links lead to content hosted on compromised WordPress sites, a common tactic for distributing malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://etasystem.net/userfiles/files/3691595811.pdf In PDF document text
    • https://shidoremicrosys.com/media/dafiwarabipito.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160774c2511bae---41657377117.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/99155071660.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/bowevuduzivug.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12578166577.pdfIn PDF document text
    • https://actor-conseil.com/files/file/90462414322.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fewijipes.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/lufibepirorarixoxata.pdfIn PDF document text
    • http://schokobrunnen.com/idata/25744706937.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/neneminaxegixi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2ebcfe3f---bilasajepewutetaxuzenexo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1bf3953677027072ac29bb2b89f4eb77/7249980198.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/pomusajujizanonepuk.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/51871828005.pdfIn PDF document text
    • https://actorconseil.com/files/file/79947046028.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/remixubirumimozoli.pdfIn PDF document text
    • https://kopari.hu/files/file/xunewe.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/sutepivudenawex.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce421a8d07---67358834806.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/82122503195.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/moxifuxitiwo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a9e70d49---kifafatabiwut.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8f33d530---nelututexolizuva.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0296f31b84---kefurabejujutege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=double+stack+container+trainPDF 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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 17412 bytes
SHA-256: b49c2bf2634f5645f49bc9bf39a0ab3453e6c1581737fa6512d41a9509be859f
font_01_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 10556 bytes
SHA-256: a99b1462b58903e17e8f090ae84385952421f5d13a396ca77cb5bd743fc1d7e3

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