Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97e47ca7f0afb4d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 12:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47d8992acdc4799f73efdd91a54acb9e SHA-1: a3a9c067030a5b7e901d43ed911df702c497cacd SHA-256: a97e47ca7f0afb4ddfacdbbfb16e3f1b9ed4589fcb401002f6e639ccc2123950
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the ultimate destination or host malicious content. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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://tentimesneedlehill.com/UPFILE/userfiles/files/14436746239.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210918133807_119780938.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/jedaveb.pdfIn PDF document text
    • https://udruga-invalida.hr/files/9777752069.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/23724170012.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/dasudujo.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/da2dd5b3de36d08f11227f8d0bcdbbc6/88291401305.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/85354930597.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/98932688508.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/bimegazin.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142efe39f833---zexesibexum.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/magibuvezisiti.pdfIn PDF document text
    • http://fygl.net/uploads/file/100322596430.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161499fcfc6a41---97609874123.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/83310236527.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/352217512.pdfIn PDF document text
    • http://thevalleytrader.com/files/moxiburo.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/fumigujenegon.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/naxawebaparikaranixa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/mudizatijifer.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/26200486349.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/13857045566.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/suzimedabagasajovofo.pdfIn PDF document text
    • http://glttek.com/userfiles/file/88322209705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=turn+old+phone+into+cameraPDF 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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 10672 bytes
SHA-256: 87d6ebf8127795f7f4bf918649c6ea13c70df7142530f446ccc289f7149be865
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 17672 bytes
SHA-256: 0721c220e07a98920decf9ae5ac1e4f5af08b2bab1e95c05326acfa2eea3893e

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