Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f697a0b8ed05908…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 18:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01f24ad68ae246f362e1561705548d08 SHA-1: d22777b321fb399824091f108a13bace11fbfd79 SHA-256: 7f697a0b8ed059084f25dfea2a3a48ce02437a4335be5a0c5eb8cee65a709f1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, designed to act as a link farm. One prominent URL, 'https://huntic.ru/uplcv?utm_term=fnaf+1+free+download+windows+10', suggests a lure for downloading a game. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' indicates malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://huntic.ru/uplcv?utm_term=fnaf+1+free+download+windows+10 PDF link annotation
    • http://asude.istanbul/ck_images/files/73426635608.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/76625400739.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/60478489589.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/vimefox.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/63512199581.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2ba5829150fac9dc4a56440bd4c05726/56501232474.pdfIn PDF document text
    • https://zzhqhi.com/d/files/98565134913.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/balag.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/29196508885.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/gesupopogefabewutuw.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904110235.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11f02dfab---nugorivuxid.pdfIn PDF document text
    • https://shibbirs.com/media/files/tinudanijijemibugogalo.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/1852602566.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/mataxubibusazokilob.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ep57k4vurs1gdks1f9d69h7ck0/peligapovivigipo.pdfIn PDF document text
    • http://guitarenko.fr/img/files/vetuzuzekerof.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396f2c133e---saxixema.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/mopameniviwepupufubax.pdfIn PDF document text
    • http://www.moyekolodin.com/files/vafenotipafif.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/94602723529.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/pazutimagetokideniwixo.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xubemurexofera.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///84707384747.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 10488 bytes
SHA-256: 6e129a8ae529f9c09ee5da553f0fc0ef6cb911a030a5d074922b86bb901f92d9
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16684 bytes
SHA-256: 6deb57e34705b8cf64566487e656741959772ef5486d7cd4602e089b92671df2

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