Malicious PDF — malware analysis report

Static analysis result for SHA-256 144d1cfcc01771ae…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01abd9d7c8c5493821434cca64ce271e SHA-1: 3172d9bb9cf8a0ad82c7d4361ddbdf712245e989 SHA-256: 144d1cfcc01771aedd823a088f68ce8525b8bcaac0e6e8a21fb6c061d9683838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://allytemp.ru/uplcv?utm_term=one+tree+hill+pilot+script PDF link annotation
    • http://diakmelo.hu/ckfinder/userfiles/files/denidaxidavasa.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/56971665717.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130af350ef98---tuxip.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/kivazojumakovebiponu.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/luguvumiwusuwisaw.pdfIn PDF document text
    • http://sissonne.hu/editor_up/12313076481.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/pumopefudidiri.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614666185359b---86281982143.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/80355105767.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/gevarogom.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/aba9cbd22cc579e2fdcceeceeadd086f/limuwufonad.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/jatuxefej.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1360a07bd721b8f43494f35cc90ded44/zezawogam.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/64634363463.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614320f5b056a---nilujakime.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/kujawixukozopofudo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/bopisokokedovuwuferufex.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/fuzikikedimifubi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614353ae6ff78---pokizufapedowet.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/duvisinov.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/patalusukiretivutakogibos.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/5240278263.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/fibunavavidinoxinuni.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vri0tbepe3hktcv121mrgf7hv0/75255352879.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/mazemasafilafuxunajemegi.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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 17184 bytes
SHA-256: ccb809a5777cee3606225c3f03ddcdb78081984b3b2baf278a102af8f293c191
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10336 bytes
SHA-256: a8493b17f9345bdae2b381e5acc47baaea4eac8bd77c93113f974fdd74a35c2b

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