Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f748a1fe2793a2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 05:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73269936293363f11b79216c4bcb0552 SHA-1: e1b5a4a1f50a1d16917432be4199d443999bf22c SHA-256: b2f748a1fe2793a2ff0d94d22f9773c34c92d57fdb110c00ebf001b494a5310f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the compromised hosting implies the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://queure.ru/uplcv?utm_term=stirling+engine+design+manual+pdf PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb4e34773---wobujedapaxaredipujadoxon.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/99360480833.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca1841a14d09a589b4786ea6b6ff5e2b/dupimufeliwaroniwi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0a56086f6f6dbc5e7fad88c8463d294f/70764794432.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/292f97ec7ba8b534af12a953fc6a662d/wemefijasedigagimejer.pdfIn PDF document text
    • https://12tiga.com/contents//files/kulafadigexekipuwexaf.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bf4293555f66ead02b10a7ec0baf73d4/mopivadigufefamemo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/fimitulugomukizedugodir.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/vajigebazozekusilevareg.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/766854598.pdfIn PDF document text
    • http://4bx.pl/public/file/wipovag.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04b3bb0cc---kuwaweki.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/bizupadeb.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/es6sfe389sofe42osu3r7g53v0/7895723688.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7411pel64ms8mrs3dhp0drk8o1/lomabikukawomat.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/53965203028.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/82042714180.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/furume.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/vozibariwedigevudu.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/78110355651.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qhcb4gkrcjkusklm13sfu86fva/87930048631.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/7c20595f441ebbb1c7feda1c3d63ea12/miludi.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/47942659962.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ctvb26dqnch6f04hprssedqdb9/6640101582.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jesos.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/64761485294.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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 14028 bytes
SHA-256: 757d90285f50c2e116c6d5effaece2b78783fad42ea34eb60019a2e3f89f8382
font_02_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 10896 bytes
SHA-256: c60e8680be3425fe3f1b56f00d4f0a94ea5f3b8a5bf4fe698f74c260def77e86

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