Malicious PDF — malware analysis report

Static analysis result for SHA-256 33329a985a53684b…

MALICIOUS

PDF

88.1 KB Created: 2021-08-30 09:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b8b8f55fbf600aad00ff5ead4bba5fa SHA-1: 3d719e61aaca56b396d575cf70324bfa29b5e274 SHA-256: 33329a985a53684b3b1edc4e3e06aad528c87d507ae741f1a5d119484e717206
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly indicate a malicious intent to leverage external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://discovercefalu.com/_data/images/file/zopuxefak.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078def5991bb---witeza.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qeorh4qf3nb56c2e4hopdktfrr/44679558778.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/mijafevitajujezowifimexut.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e176aeb2e1---beragufanosas.pdfIn PDF document text
    • http://bienbao.org/uploads/files/kemetetilemutopeteb.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608861c629d45---11969263013.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/58037014441.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f2b7ac0d648d4e646ae9c3d18c060e5e/zezakaparulagebuwazulo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944935c3c8c---fufisopabopumisexopetozi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff563abdeb6---noxepojovudufo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264bd1bcc---guwevofumedowirinefu.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/86359390895.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8adcef97---79618324491.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/57747445354.pdfIn PDF document text
    • http://prosquash.by/data/wuxanunu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5e6fc0b618aeb3f36f8caade00dafe5e/bomepogonawulamebirotik.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/gamatadinomajadoli.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/33ff73e1ce5d82a6139d8b251643817a/3957240591.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/wabesojesinipetukazinapa.pdfIn PDF document text
    • http://armanetti.com/images/35478581736.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e20bc6c9---darosaf.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/bulakefisogumiwuwinozip.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/wujer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=plastic+curry+comb+usePDF 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10644 bytes
SHA-256: 3326224de009b57865941d11ab1b23e56ba46852cd95f398510d523730c60d08
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 16988 bytes
SHA-256: 0f0334a3ef0ea6af2a784f71bc8038220125bdd2ed577d6f58430ffb305cb005

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