Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa53d96c7b16ef40…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 15:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49d8280e63a46bdb8f89775e6abfabfa SHA-1: eef50f40e29f2cac48c2b36711eb25c870b37c3e SHA-256: fa53d96c7b16ef4080a86c0e82a78ec7503a19b313e9ccdfdf9a947fc016d97c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which are identified as compromised CMS upload storage. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The ClamAV detection further supports the malicious classification, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=how+to+install+vmos PDF link annotation
    • https://goodmix-psc.com/userfiles/files/69691168244.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210903142608_xrmoie.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/2119762229.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/67963574505.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f85562807---26245328160.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/bulenubetawutapaxa.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/xusexodabosaziwu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f044c199ec---bibebativadafasirogelu.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/losufoxetitedolukelew.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/migukoguzaperajutisilenog.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/gedojasu.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/sebugexetunuvitibuke.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/waxuwi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/29025581c32f37435a09e5de7bc78fd7/lafirefumesawal.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/shf0o8jc5c63klm56591d9u02a/vigiboligadofifoge.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210915163000.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c49ggd7cklt6cce9na749a3od0/rugodimilupapewozixen.pdfIn PDF document text
    • http://wirheiraten.de/images/file/5830356790.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/30294717798.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/24635898645.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/21841245529.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ae86a7814495a0a871e3d28ce5012089/regirigosum.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/79467140229.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/fifitifabotowusukifezaga.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/52883629499.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/40123583600.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a57139bb7---votolemurovigixubudevobil.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_off0000ceb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 15912 bytes
SHA-256: de9b669dfcbb65f47fb8b65844150adae1883ca120ead066ea0d2e6db0392c83
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 10180 bytes
SHA-256: ea60ab4d648f717cf8bd6a3eda3086d16d2660c0d84a34a0e4013f6911f6433b

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