Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a46d3c19afef33…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80178dc8a36343bba144e2ce826ea968 SHA-1: 9ab0ac225eb3c2e7c28728f31a44f6ecec5087f3 SHA-256: e9a46d3c19afef330ffe85c04a95c5f36851373f65a5a773927e941adbded146
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to link farms on potentially disposable hosting. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam pretext, where the document likely prompts the user to call a phone number. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://byecook.com/ckupload/files/potepuxoxunorekesuzejowen.pdf In PDF document text
    • http://emilygrilltogo.com/uploads/files/jexar.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/84505783164.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/7544056233.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/88772683969.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/20203484527.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/40361368452.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed0092a78---mugozixaka.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/96493950772.pdfIn PDF document text
    • https://camphacement.vn/upload/files/varerulelotokadur.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/72632225199.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161425639dc7a7---55871949132.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/52098687569.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/95283218963.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/sapesobokonukurijokegofis.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/72030124091.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/44865942758.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/saviwuwijusukotumetaden.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/sakewoxudozaxu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rtjtcq4vpj7v6pj7qeu3ue73h7/64400425370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hack+gangstar+vegasPDF 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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 18088 bytes
SHA-256: 232ec5e6cd97ce5317f8d982f222cb5e3a6e1daf9ca8b2412163c01196fef368
font_02_sfnt_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 10608 bytes
SHA-256: e4ec13bf19104624bd5df0a89ebb5cef504a6440b611a4e717e0c8a45d50757e

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