Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c39491a0db83543…

MALICIOUS

PDF

99.3 KB Created: 2021-08-25 12:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41b09538fa028f5b7fe2b6aba12e4498 SHA-1: 0e607e3b37f6b9aa3657b06619d10cc919eb20b5 SHA-256: 1c39491a0db83543a5bf97890f70eab8dea414448f75678bc5f019d691b3aa6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic specifically flags it as an Amazon impersonation lure, directing users to a non-matching host. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or trick users into navigating to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=arc+length+and+sector+area+worksheet+pdf.
  • 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.
  • 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://zzarosiscarampola.it/file/sivegurazaxikosu.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/850662ee9ca9b7806f699c0f5e7579fe/gimofezin.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/peratakarerusirerisu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2005c415f---lixexizilofuvusoz.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xekafojavabaz.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/67975258488.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/17989862502.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3257e5de78---motetarukigad.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfe3d1e503---16010600418.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/veleris.pdfIn PDF document text
    • https://eternalbliss.net/file/54293107327.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/nn714r56km2jeguofg60utu1iv/55105135680.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c18a5aae9ac---godusifotokuriza.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/dijel.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/78177150560.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/85467763485.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/3353528261.pdfIn PDF document text
    • http://bjjiffy.com/upload/dofifapuwit.pdfIn PDF document text
    • http://billsky.ee/files/file/78622769401.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/36874010127.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/fazirizaxodupetowelodexux.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5ae17712---60669824095.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///lunixixudubu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0b3cb0cd0b277188286c52f0f7ed41eb/resupipakaparirimuxikif.pdfIn PDF document text
    • http://cl-pub.com/files/files/79174726574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=arc+length+and+sector+area+worksheet+pdfPDF 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_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 10964 bytes
SHA-256: 3ced0773dc1008be48774364134c97167305742e2c77943e329327e36a9fb6d8
font_01_sfnt_off0001366b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7D 18220 bytes
SHA-256: d6e8a5f2cd4068601f127471b3bce3b383218f44ee2381671f329e909a090b52

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