Malicious PDF — malware analysis report

Static analysis result for SHA-256 8104b16a75dd4156…

MALICIOUS

PDF

86.6 KB Created: 2021-08-15 06:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 376f82452f022791247d58a22b7b52e7 SHA-1: 6a81ded53c16050739ba0e2cc2a955857b5e5238 SHA-256: 8104b16a75dd41565f5e81bc7787c5ca9b5e745c18dd8e7f08ef6f81787a8156
176 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a callback phishing or tech-support scam. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to trick users into calling a phone number under a pretext of urgency or dispute resolution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://stehovani-ostrava.cz/static_pages_files/file/menel.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dbf678c7f---64489349529.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/29671268728.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tezabimeg.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/jofejozuwabave.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a335405e12e---rumuzepadobu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86a345b55---89259736755.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3b6a634e---gofeseja.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a1a5f241c6ee2d01f4650079cca7b5da/vepusuwasegevovow.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/85473239458.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/83538201968.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ngl4qjtotd76nc7kphfd70vu5j/58194850148.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b78047a2f2fbea32542b025814f61735/gexijeranido.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/35539710777.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kiqphk6b6r1aob02h0uqdpnuni/55900971175.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/44554407237.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/78266293558.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a9767a8d1---wevisurujot.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/41100230387.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/do7pk6kalvih57cc37pmu6b0vo/60865361684.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8fcc8550---81663079314.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa3e9b1c37---83704501031.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f373e53cd7---dapazulizeso.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/fizaduxugetifetapokilix.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bowagebesilufirakukuzi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6b23a676---7704236446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=exercice+mesure+de+longueur+cm2+en+lignePDF 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_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 18528 bytes
SHA-256: 38a2c127f8a728d2bf5c58c9d3ddc109b346a5c0a885343a29c4080e7a9d1d7d
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 10756 bytes
SHA-256: ba0297413e886b8285089f03ad4b85654b55afd71bceff529821bb408d693ed3

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