Malicious PDF — malware analysis report

Static analysis result for SHA-256 759f3b9cffeca2de…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 12:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43c7972222095d91b06d46ea04465d6c SHA-1: 97f97165cb20c5720e71bc16b6dc1f677162cd8e SHA-256: 759f3b9cffeca2de85832b4d421c3b5c06f51079f8f65c4bcc2bfd3e10d02f77
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609820cb909d3---zipikimesurolalipejukule.pdf
    • http://ymmicro.com/files/files/55710036979.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ccfb68952---254964311.pdf
    • http://palaciodelosnavas.com/userfiles/file/54341701348.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/70234d260c08b95b75f2f3b66d39ab79/kadopebewis.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c8c0e94775389fb13c278a4974a10ba6/solasulexozipiro.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610033e728519---barevironebukez.pdf
    • https://arte-salon.ru/upload_picture/xadekisebog.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/65516859067.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f34966ee53603cff7fa1dab63e573fa4/31913297629.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f419621d---tugagakarazimes.pdf
    • https://homeuu.biz/upload/ckeditor/pages//files/39950755672.pdf
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/jexigepifurojofuxazexula.pdf
    • http://iaestedresden.de/userfiles/file/mafojexaguxowevuza.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc51b5bc9---valisena.pdf
    • http://grawerlik.pl/userfiles/file/62800923673.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ee523889e41fe7c900634d947413d02c/49220893492.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3b63fc1bb398c09cdb250baf44c0eacb/95712269444.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2iv313l0ub74143nu7j702n08b/rilivanoniku.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/207vhm8vgatvmigi2d3v3p3i96/javegidorewudajutes.pdf
    • http://bielwod.com/userfiles/file/buzatalarejakigogujonuzev.pdf
    • https://b2cexpressdemo.com/userfiles/file/xurifewunij.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/vututexapu.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/db48b013b2c7ba89f009d3f65fe4b2e6/kiwosufuvorav.pdf
    • http://botosani.ro/img/uploads/file/96875993453.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/64855825666.pdf
    • https://begili.com/uploads/image/files/fobaniboxiromevipidukej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=casio+referee+watch+manual
    • 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_off0000e775.bin
b904c45e17243464efe810a16228fcf5d0bae92b58abfb82a611683193d01857
pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 19232 bytes
font_01_sfnt_off00011923.bin
dc703927bc0add12117c759b4f102c28b06d4e71f1cad95ffec38fb56a8a4cee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 10820 bytes
font_02_sfnt_off00013204.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 16792 bytes