Malicious PDF — malware analysis report

Static analysis result for SHA-256 abecaee42e7aaf20…

MALICIOUS

PDF

101.8 KB Created: 2021-07-02 13:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c1dbc9d623d9b80d21c704513a7c3e5 SHA-1: 1385fc9d02aeaf424639b62fe63c70d3cedd3a12 SHA-256: abecaee42e7aaf20f6c339deab2b6a678cb684f1c29a3093f65ecaf7b201a7eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites. The primary attack pattern involves redirecting users through these links, potentially leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/svrnaalk74gnrl8aun91geck00/11079420714.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ede9509d0---46186119860.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa93687492---2202699150.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/32876974189.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/pofepuxakagudejonimavizi.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/36108112154.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee204b0ae0---rufok.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076f78a52d43---94732012467.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2acc5db01132bc6355f33f7be2e84eb4/61677018391.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/sidetor.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/25433023559.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda744396a---batirurefafudelikosakus.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/veruriravuxerefirinug.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/zofolijapotesov.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c40759737ef20bfd8aef12f594fb86dc/jipuwuxupodurewukatowegoj.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/421ea00750545c77c81a2cf7c3dfd543/77629477688.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac917b0ff92---68631866932.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/tasuduzisoso.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/kljd6am0uupetlr2a9a1bdvqc6/tagajufuzekatatufivotu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c30b242b052be7fcc02b82b1ba562d6d/redezisolitabodufavaker.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/07eej6dosffjs6u0eh2j9k93o3/kabumofun.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1f04159995d7280fb3df23b52ad2ea07/87218960544.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9af0f4a2---5625108738.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd38ae0e0---kavipuduzawajudonolisamos.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jopimoxolu.pdfIn PDF document text
    • http://valeneighbors.com/userimages/66119916910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=philadelphia+cheese+and+chickenPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b56ef10d8837f8784c270c287c7b32b9/wetopimuredazavamuwo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 10388 bytes
SHA-256: ef1c36f4254388a463ddcf78705bb077529fa0521d092324f83e72cd1c05b431
font_01_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 16804 bytes
SHA-256: 58ab53c7eef891efdc39fb762c566e613c1d6da86b974234a30657d42a281479
font_02_sfnt_off00013fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BD 18164 bytes
SHA-256: 20cbc1f39961cb9c073973aef430fb8f47f5f32e80785a1d7ff16e5b1b91492a

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