Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c15a72cf5c36384…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 01:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a303de8d62690cf0f65c13080f0ce23 SHA-1: 3a39a1977a53c3849c1170a83e1409aaf505790c SHA-256: 6c15a72cf5c36384259ede5713d9cf13c7dd7efb7451fdbbd94ade7ff461cfcf
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting it's designed to trick users into downloading further malicious content. The presence of a "download button" lure and callback phishing indicators further support a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=texas+driver+handbook+questions+and+answers PDF link annotation
    • http://caf-ljubljana.si/docs/vaxezaropor.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/juxizebafot.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d947f3db0---zuziwuterot.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c6a4f09---lenazulopofakanoza.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/benijidato.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/95921686770.pdfIn PDF document text
    • https://ags-car.com/upload/files/95121756400.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jogeloje.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4222cba8---xikodupijudanodorupob.pdfIn PDF document text
    • https://olterus.org/contents//files/kofolekigolusil.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/30a623430de0866e332b0388897b9b4e/ludufebavojovurup.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/nefoza.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612127f519161---fujizugujovisexukiven.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/kubuzi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ac7d13e3---25319156652.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///napopujogabit.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/bilosomisepe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bb00ad3e---remamajojubezojiwazi.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/50488453195.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/gagifapixofutijoxawifat.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/gimuriwatoxexiromunuwib.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/73176984595.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/22721842370.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff865786b---3667186995.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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 19372 bytes
SHA-256: dbfa6bd2134a829481219c9de05c012345edca725ebaf957760497cc489d5d14
font_01_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 10996 bytes
SHA-256: 81fea85b2ba8547b0c04779d762ef3f7106ef7c99252ad80ae2e3a5297549608

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