Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae3a79077a70d59…

MALICIOUS

PDF

101.4 KB Created: 2021-07-05 19:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e2ce38e85851c3ce99a879cdb490cb7 SHA-1: 8d1546adaf091be4abb98aa3999c423dbe1d497d SHA-256: 3ae3a79077a70d59851dfed663e8ec2f0d412e068248cc8bff02e031b4a637ab
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. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to chain malicious documents or redirect users to phishing sites. No scripts were extracted, but the structure indicates a deliberate effort to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://irlanc.ru/uplcv?utm_term=pitbull+mix+with+boerboel+puppies PDF link annotation
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882c2052f9---3831903179.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2df4eb240---wasimamamomotak.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cpmldntj7qlneofmtcn35mr8p4/zodivaza.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/5rsbbb35lffjd63hedi8j6oe34/9521001140.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/46709117495.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/numasevivajupazuwilalo.pdfIn PDF document text
    • https://strechybenesov.cz/content/38250510953.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l8to59vhbp9pbch5m5akd9k7u2/5944866968.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/53959889723.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5bc58e2c---88968446749.pdfIn PDF document text
    • http://jakspravnenapsa.cz/userfiles/file/6792919721.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a871c0d826f---metim.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ollhdauno38a6gdcocnf3g41vk/dijidejiluxorisofijoza.pdfIn PDF document text
    • http://c-amc.com/upload/files/zaximafilob.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e08968ac---juxaluvozu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c776ae9f729---43537844249.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d8b53f921911898d16c891f51b958d0d/jagozavagevux.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/72245971992.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c22080eaf23---41818092865.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/mozolezobezekowuwupefo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5e8877fdb3a3c6589755151490d0e000/42010811148.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/vilovumivinufabe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd298b1ce8d---virubomufonomofofewana.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_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 17004 bytes
SHA-256: 88c546914e17c230055b6e538ba30a4fc48e2c335db503760ec30c63e45e0ec0
font_01_sfnt_off00015799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15799 10680 bytes
SHA-256: 1bf84528216a2948133a3c4943e0b61fbea19d40a9a0c0550edc74ef5bdc024d
font_02_sfnt_off00016fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1