Malicious PDF — malware analysis report

Static analysis result for SHA-256 f775a680da399fbd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 16:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b65beeae43931bec288071cd217d6acb SHA-1: 913c72475a3e7c6be8cb2da384cb4413695b8576 SHA-256: f775a680da399fbdd4bfd9fc2e1125be8fd36a576786a1ae0ae3e4315a23d8fc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. Embedded JavaScript and multiple external links, some pointing to compromised CMS uploads, further support the malicious classification. The primary attack pattern involves social engineering to elicit a user-initiated callback for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • 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://geoass.eu/userfiles/files/33328246139.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab7512706---diwalolagakepirex.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f60c28cec52a9ae3b78e5925d3d63b01/rebiwobileduwofijagotiwu.pdfIn PDF document text
    • https://roc.mn/uploads/files/70746501983.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d46be5f99c---bigizapipedoxasexoru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086895bf10da---bozaxepo.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/58890431093.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108060909012169.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-11/20210511191058802364.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/q6aco0ar9itp8cjquipiteeav4/sumupiminulasulabem.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210526060504_544078196.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/dawowozalidonusosaxuteja.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/xepuvamujetimeguwowopenob.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd589f4dc16---selerawefebifaxaxatumoxiz.pdfIn PDF document text
    • https://efnnma.org/files/file/15577677499.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4637f3d5---93932495880.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/54703799598.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/rokudubekutewanevapefoda.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/53631283381.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/67680310019.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/55597133930.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dsc8ecd4trkl1q4bpqvrmrprge/74218869357.pdfIn PDF document text
    • https://italvaping.com/file/49654654368.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/pobukokukovitirogano.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/52063258329.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/54500c50d743eac83917c8814d8d52db/xupomonupeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fantaisie+impromptu+jolivet+pdfPDF link annotation
    • 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_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 18424 bytes
SHA-256: 7920e8eed06d35b23e5f6f75077222da0d6b50bc664b4362b99bb14f50e292a7
font_02_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 10932 bytes
SHA-256: 5820d592b489b981814fafcce583a80e2e43c001c9d3e36253a6af5fa8dd6530

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