Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13858f628ac9789…

MALICIOUS

PDF

101.2 KB Created: 2021-09-21 12:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e9f4d58b559093e6c9d7a3df91fc1e59 SHA-1: c02ef06d5c770c8df4c95c64eac8ab00b7e1ecf9 SHA-256: f13858f628ac9789a884f6341a3050f201e8128a87c77304d3f59583d92fc1f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. The presence of JavaScript and the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=tekken+3+game+download+for+android+mobile+apk PDF link annotation
    • https://charming-dc.com/uploads/files/202109070356505969.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109141550094004.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/sijijuxirutinobepef.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/zeruloxakazununizaji.pdfIn PDF document text
    • https://artbynela.com/uploads/file/mipidajefomofifeb.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/82227024502.pdfIn PDF document text
    • https://ms01bet.com/contents/files/rozobakobajozidu.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/56778001393.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/rasorovovidu.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/dijupodogegenewi.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/jofupavepatavolos.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/lojexedubikipitedu.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/guxedugojabasuvobalure.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/nejolokitefujixamuge.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/bugokowutopumataduvu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c86297330---zovikube.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/dawefobufapafifetawazu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146792f2877b---wodijiduzaf.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/71339867206.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/kipako.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/df97fdecf462c5f5605f009b35826aab/39727042304.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/1108351746.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/powikag.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a1c85e10028162c6a7ccb78046253e4c/53777833397.pdfIn PDF document text
    • https://jck.ro/userfiles/file/67397448114.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_01_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 26452 bytes
SHA-256: 10de35e6be0727d435f339fb05c21c85db2839b3fcbad202cc1ef8b402b3365d
font_02_sfnt_off00013eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000156cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CD 11028 bytes
SHA-256: 733e63962ac88aca3223a10f1aacc72440c858eda7e2b2f51be03ddf32394f8b
font_04_sfnt_off0001700b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1700B 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4

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