Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4b04acdbf829e2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31813dcdc1af877b157c62ab66240851 SHA-1: 8aceba2b3e495acf2f3f86202a208db4801387e1 SHA-256: ac4b04acdbf829e2cc148886dfe589f29b7ffd5ea9b98c96954a607c10d24f7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ngor2-3.com/file_media/file_image/file/wupujudedegepumuwi.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/mevetaleporoli.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/96f82f7f0c73d9f423f3b7bf290323c8/ledizotixukipifev.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/9006088925.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/vixoziwapa.pdf
    • https://starbox.fr/img/files/39437464993.pdf
    • http://feynburg-uhren.de/uploads/23523131473.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d74b82b09d---67680942347.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf262d92298---xapepibuvimejolub.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b2b027e3741c30ff99f5e5604c12e0d9/xafusevew.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b58a28f---rugivagon.pdf
    • http://pattersonandoliphantfamily.com/clients/875492/File/bepuzinewo.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7241ea6e7---dopijupedapupo.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/99685886597.pdf
    • http://cpils.com/userfiles/file/dizidotadoloke.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0ab93103---dozipozogugovi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080727b8ca64---44569488227.pdf
    • https://kisikana.hr/userfiles/file/gukuzoniwapuxasogolojoxa.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1dfbc23e74bde46a9c386923b76250fa/96433925815.pdf
    • https://geniodelweb.com/file/larawopo.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8402dcfd7---wedoparati.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd89de784c---zedurad.pdf
    • https://airxps.com/userfiles/files/61104157650.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/5551130051.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mercedes+a+class+2017+owners+manual
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a532118d687f877e7d25f53f5548c6d1/kojefesaxifowobivozal.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/40df180ff16ecac7a0712368ea783ee5/jerigomobatik.pdf
    • 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_off0000cd79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16792 bytes
font_01_sfnt_off0000e58b.bin
dac586f5b6a37ea31342489ed323bcbe0f58eb056c09e81f5beb1fb00da2ca2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17200 bytes
font_02_sfnt_off00011243.bin
ebe43917765e6dfafbd19cccbee8c12379b699fbc77e602d81fe425256591325
pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 10864 bytes