Malicious PDF — malware analysis report

Static analysis result for SHA-256 11afa319cef1345e…

MALICIOUS

PDF

94.8 KB Created: 2021-08-07 17:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71f5876e22198d45f519fb2b98dd0918 SHA-1: ed1b1d09ef8785792ed499db5fe1da04d9a65474 SHA-256: 11afa319cef1345e2ba8885de16c7dab5017cccadce8ed94325351324262e6d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa6d9dc9f---5030927919.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8aqq4jfh4460325nho321phl34/62517272203.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/31c7289e4f2aa5be90d4173fa736f7e0/nidamokegusiretixuzurova.pdf
    • http://metrocars.london/survey/userfiles/files/damov.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210604_EDCF90FB08AAA71A.pdf
    • http://royalrep.com/userfiles/files/4234333434.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ea79fd21---sakonagepububodilojitufot.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1b34fd71---zemixemalawexulewano.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/210609095514986644pjzhg.pdf
    • http://qkmedica.com/uploads/userfiles/file/74443787590.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db36214b24---67805843234.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/o97rtq1mbae123lck7iiu8tmfd/bobazewivorovebima.pdf
    • https://galedo.cz/www/data/cms_files/files/25700487716.pdf
    • http://wksx.top/images/userfiles/file/77009402560.pdf
    • http://eprdel.cz/userfiles/file/lewipamepodorenivadofoxiz.pdf
    • https://atvatextile.com/upload/ckfinder/files/61216379461.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607008d811e5e---34853804883.pdf
    • http://ahdjcm.com/upload/files/lolipazusefitigivuwot.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/monumokite.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/02db3b5138ec1dc29f2853ad2922f305/72710810817.pdf
    • http://location-appartement-venise.com/italie_documents/files/nexesubuvarutabodew.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fe395a314e2080add662bb42c06a6fff/20302048419.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/falusifamatafa.pdf
    • http://fullx.net/files/75594970413.pdf
    • http://dobrasekacka.cz/userfiles/file/86497959880.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fca2acefc2d---27766234363.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cuaderno+de+caligrafia+para+tercero+de+primaria
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ab7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 16792 bytes
font_01_sfnt_off000122c9.bin
3624bb5530174bdff6d5313bff61179580213161f7e0b3586917373f1e79cf7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 19084 bytes
font_02_sfnt_off00015264.bin
798fb78fda5b9de64c6f12833538c7e794faaa3657571b1a30885f6a2bbdd1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15264 10928 bytes