Malicious PDF — malware analysis report

Static analysis result for SHA-256 a629380340cc3ea5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 01:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e0330d7cfe08290b436a814e894952c SHA-1: 0551216a12102509dfcc38e81f8aaba660a307a0 SHA-256: a629380340cc3ea562e3b37fc2718b33cc8a09de302988b0863c009f8f11d9c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic firings indicate the PDF is designed as a link farm and points to compromised CMS uploads, with one URL specifically mentioning 'adobe acrobat pdf reader free download for pc'. This strongly suggests a phishing or malware lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://allytemp.ru/uplcv?utm_term=adobe+acrobat+pdf+reader+free+download+for+pc PDF link annotation
    • http://e-hematologica.pl/users//file/26794764363.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/kumazub.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4ce3b3325dee72b5ddcba702d9fb843/liwalitakumopapebivi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1a0e6e5e---1359172551.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/damoridobidiwo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/8i65ivcbcv1dnigemanfm1p8on/46627264782.pdfIn PDF document text
    • https://pixel.bg/img/file/xodebenulo.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/vowupevapogujebatidifamux.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609904fb6e82b---wowijokapuwepukoruraza.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/kobajefuzez.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/60758885669.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lebafumorijibume.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/bomadefizalukufowovod.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/16596611609.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609805641ecc2---jijemajol.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823ecd3db8e---93982485205.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/kodem.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c514f1dc0d7---72914938369.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/sidirodeviwijezavetoj.pdfIn PDF document text
    • https://tdfstore.it/file/37469079427.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/17720342826.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/50e0b97ac1132729da7bd4216095f3f2/92246450811.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a421022a440---saminubuf.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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 10560 bytes
SHA-256: 28b03c65a8cad4946c806b2b0fa1b24b372e08369b14e7a43399a02201869420
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 20108 bytes
SHA-256: 3b6ace4e5b15908ddb15c2cdd9f4b750f6c30d865bb189e3f57edba4231b965d