Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc53e07d5033e309…

MALICIOUS

PDF

73.8 KB Created: 2021-09-22 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2ff927a6886ce1b153935b5d7a9729c SHA-1: 97a772b649cab5b384bc595458ca3ae522fe1afc SHA-256: cc53e07d5033e3092c104b1e41d2e747dd3d51cc2f721ae80d5c4eef5d239d2b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1598.003 URL/Domain Information Gathering: Link Shortening

The PDF document contains numerous links, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to distribute malware or phish users. The presence of a callback lure suggests a potential social engineering tactic to trick users into contacting malicious actors. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://ilkjv.com/Images/Media/files/25961442562.pdf In PDF document text
    • http://shbaicun.com/userfiles/file/2021091220100673499.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/82003437296.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/57206687749.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/pivasalugamaxoziginu.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/98070217105.pdfIn PDF document text
    • http://kgmda.com/upload/files/39208201138.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/fipulipuwareriwutuzeb.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/90230572664.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/9763661912.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/90307546160.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/turukuxupupukonu.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/figojizur.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/wolubigurujoxukojesasado.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/xitupizutekivin.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/aba9cbd22cc579e2fdcceeceeadd086f/limuwufonad.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/nixusanodax.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/bagenolupeva.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613add3fb1001---xaletef.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161419b00b4bf0---bofowatolupu.pdfIn PDF document text
    • http://sieuthibds.net/images/files/laseb.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/39889718960.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900fdcbd2e---ruwoxenip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=windows+7+home+premium+oa+sea+downloadPDF 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_off0000bfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB3 10788 bytes
SHA-256: b41fd458dd6ba21057dc72cbb390242a78794d2391741b3eaf1dc0c1f46d8641
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16076 bytes
SHA-256: 428fe1ea417d814c64994ad039e494192ed1bc8bb14becb09c1ea83cb73b8e26
font_02_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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