Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d8e531aa64201f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 07:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29321b32b25099166c9ca6512d0a2db2 SHA-1: 9b8afc92c3cb6284c3c5b524007cb5db0e3f273d SHA-256: 64d8e531aa64201f1cdb011bfad5bb0763b2ee3a2073be250e3d978abaee269e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=writing+a+request+for+proposal PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0fc147f3c0a694c93bd230d1f4063037/86077270769.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e9b640259fff3e18e23f74aa45f63ac5/85943431872.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c3a9c08c1---16548263862.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/38027587794.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/zojew.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/68ac26457c5313e4c977d060262eb5e8/domotopesewaxufaxo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0k419uc64onlpk7u8636um5l81/wezuwixujakefebexege.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/19650719948.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607081760f349---5061434049.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/47696896510.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/50821934836.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e1467a14308cb52e1fe324464ad982c7/muxopegudusavavoj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c247457435f---76729759832.pdfIn PDF document text
    • https://rajaunited.com/contents//files/mirovivurotuviz.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0c554120e91106a3587f5fc46ad34e5a/87135184156.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/97064213636.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/dakosepapipapitop.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/5256827479.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051004161366.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/dajurimuwemolibibadewine.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/powijigo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c6677683---teduligoziwifara.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jekemopukiregivoginugup.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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 16272 bytes
SHA-256: 65553c4f2cf42e6a081af0b5a6ec4ba8d63e6a1d0a2d2ce71bd55a73bb154635
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 10772 bytes
SHA-256: 58eaa1ad252b2fad2ee38f6e7ceb9cfef0d849b41f25ebea9fdcd3a49839a576