Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3e2b9d4656af88…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 18:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df89def5a26f41e3b5bb169109564ec0 SHA-1: 53032a9e863d2cabc199e98a7b92aa730d23c0a2 SHA-256: 2a3e2b9d4656af88d4c7d624c31cc36c4752893286b1eff7d3efaf0c45416968
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to host malicious files. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is intended to trick users into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://oniceh.ru/uplcv?utm_term=physical+geography+by+savindra+singh+latest+edition+pdf PDF link annotation
    • http://universalthailand.com/images/uploads/ckfinder/files/2137045336.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/ronaworulesofob.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1eb40b63e83dd09e08a502ba5c22ac5f/1653184132.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/kojowunuwitej.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16249239965765.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb04baaf5a6---delisom.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/55479319899.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/81007301112.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb289a170---81574958880.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/2301448466.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bavj58dn42487f8as0s4lausic/xonofoxidebo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991db18be77---44358003962.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/occd3i89er50idr61oomtfdnf5/migolopuzunalapaxasakev.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/gubodonirilizubek.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/lamofo.pdfIn PDF document text
    • http://patroha.hu/file/6511600668.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vibamopu.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/ritunupemubupe.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/18568690647.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f9a1ca4b---zojadedosojusuxup.pdfPDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753d661d04f---55219976356.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb02cc7eae---tujipozekijewir.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c1201070a991a3778ecaae30c7ef915c/babanubuku.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607719b4d40d4---poxelugagezedenenorekilas.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_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 11220 bytes
SHA-256: 5a708357ba9335a7afce8b5a368a405b2179400e1c5903b4027922a2622a1522
font_01_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 18800 bytes
SHA-256: 9c7975ba4b0b7604a5d3d944b0c5c71ddeeed5a10105ebccc527079448ae5b0f

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