Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dcb519d005e8fc…

MALICIOUS

PDF

90.6 KB Created: 2021-09-09 14:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8413f8669c58a185ae2d8c75b839060e SHA-1: 86ca565c5d589cf06297d31cb439e39f181de6f5 SHA-256: b5dcb519d005e8fcde7de662f990dfd51df1f6acaa0415d683e06b2c1fa62a45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The embedded JavaScript stream, along with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, but the presence of embedded JavaScript and numerous external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://synerhu.ru/uplcv?utm_term=third+world+problems PDF link annotation
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/77566334804.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/99997226289.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/wenakanilebekopo.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/36547373168.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/60338744370.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613666a52597b---38463634095.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/wevulujipofexisur.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/remugare.pdfIn PDF document text
    • http://esistore.de/userfiles/file/bobevibojedulidetotata.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/45397901561.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/70389380237.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/44134253505.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/48f6049eea6ad109326c8a1be250b6aa/kapizuluputatexomesi.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/5587713664.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/watezu.pdfIn PDF document text
    • http://iucecb.com/files/file/25080062646.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/mezelupupuzuwamejul.pdfIn PDF document text
    • http://edituj.cz/res/file/guliwofokaboju.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/lorux.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6559e797---dagiregixokosegas.pdfIn PDF document text
    • https://ocw.tw/uploads/files/pudugepawanofikebesagipo.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/15573396222.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/90841837542.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/71465315213.pdfIn PDF document text
    • https://shibbirs.com/media/files/javuzufazatekopewu.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_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 10480 bytes
SHA-256: 3c4a6b6a8317de3e44a8bcdf521c097cb1778fc61bc41e8b86b0dc0b9ebbb1c4
font_01_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 17760 bytes
SHA-256: c3780be1768bd51ae82f359cca8344dd2c7e782dcfc22b38112f178943139cfc
font_02_sfnt_off000144cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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