Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6aa33459de4819…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 09:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30729eae590f4226fb873d395a8d0a8b SHA-1: a9d30cf6dd6e636b24a9d0bce701b92d1499e645 SHA-256: 2e6aa33459de48194ad97f8b5eb9215c41aa4aacb21cc6400fb67fd13c6cb4a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of these links and the overall structure indicate a likely attempt to lure users into clicking malicious links, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=math+worksheets+for+grade+10+pdf PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8dc9bd9e0dc202449327bb5118a67136/mojivirapepejewet.pdfIn PDF document text
    • http://zuche0551.com/upload/file/54986746409.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/87240546336.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3405a58e09---fumiwenuwaw.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/gizatirakemegotode.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/95520972447.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/wuxoxawodotix.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/20696291241.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/kimom.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/99061246693.pdfIn PDF document text
    • https://patc.fr/imagesfile/kimijugopezozizo.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/65422367295.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4fd965cf---gulimesuto.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a50d21e6d---22481451503.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0849e54b652eedcb0bbfee4c6b2bf9c3/78850982087.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5f58fefe---pazejupixatigupub.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc354920ff8---86108763359.pdfIn PDF document text
    • http://only-svet.ru/upload/files/vegalimosogonomibo.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/mexizotuduvojivowejawa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d45a04d5f---3485123777.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/15363358774.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/girukalawirapumijugu.pdfIn PDF document text
    • 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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10880 bytes
SHA-256: 0f2d3d5fa2cc2c7084c699557344cae4e3d5fff5e633cbae6c34944484510877
font_02_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 18276 bytes
SHA-256: 90c68666adea6a81f7817fdb7cc65d93c420bb96e87ba8cb9864b095e3dc556e

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