Malicious PDF — malware analysis report

Static analysis result for SHA-256 5491c56e99071ec9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 10:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d710a3247bae121cb12f2b80c9d880a4 SHA-1: 3e75fb76fa135acb62810f6082985a95d6c9f961 SHA-256: 5491c56e99071ec9cb2a228044a25d6cc308df85c893c82ea24d6ffde11c7b9b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage and disposable hosting. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick the user into calling a fraudulent phone number, a common tactic in tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=android+background+task+every+minute PDF link annotation
    • http://newtrichur.com/userfiles/file/pawabutibituvufi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/23266455110.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/dokafi.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/kenererejozilivapuko.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/83267194955.pdfIn PDF document text
    • http://hnspkjx.com/d/files/novobi.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luxesesabibumup.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/juwuvixulopabo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/13708156030.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/jefesavixip.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/vopalirek.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/mojonozowixiluwujakiziwof.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/lumij.pdfIn PDF document text
    • https://limsurempat.com/contents/files/30350750411.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/renefiwuf.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142901a0cbec---94294590738.pdfIn PDF document text
    • https://olterus.org/contents/files/9288617201.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/nivimawinolofe.pdfIn PDF document text
    • http://ranch.pl/files/file/tolekabageteso.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/14217371091.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/10051471639.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c35622b1b---zodenakoruzusizenawad.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614217a92afd3---47738375067.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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 17136 bytes
SHA-256: 0a7ec1b126dcb699d43dc1c196164ed2b6e7d3673cbc2da294625824ae190fdc
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 11160 bytes
SHA-256: 123197dc91da1253c3bcc63f88e2456fdc349601b97be765d0086b56900a9922

Open this report in the interactive analyzer, or submit your own file for analysis.