Malicious PDF — malware analysis report

Static analysis result for SHA-256 604310f49399f032…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 11:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f4330a541adbb086e9c2855d9ab1e797 SHA-1: 2b05c9ea9afe8afbcaa988597d0391c820396daa SHA-256: 604310f49399f032ad7fd02de4d1afcd30068dc53dfc4ddd9607c69862a25fb8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload, and another using a UTM term suggesting a lure for 'android play store download stuck'. These elements strongly suggest the PDF is used to redirect users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=android+play+store+download+stuck PDF link annotation
    • http://www.slenderclub.cz/ckfinder/userfiles/files/nevadefajupulamomukura.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/28038184975.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/54223261859.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/72125499768.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3a83fd8b34fb7548692b1565450aaeb0/95414527754.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tefefexixepuguwopomuj.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/migawowafifitedejorafam.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/maxebufivuwejoteda.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/fonazagevipojel.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/92270829106.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/24885489675.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/butonopujobi.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/1755085033.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143006d40fb9---70663324656.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/52475994549.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/vusebabotuzokuxaxarijop.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/53eb666a99338d2bffedb1370b7ee083/rowonujizimadi.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/54302494032.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/80459063473.pdfIn PDF document text
    • https://mfdesign.hu/files/file/15369073196.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xemijitezotegobananemiji.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd4885299---xawasifalivugadosanitis.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_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 10880 bytes
SHA-256: a57496885832b4cbb575eccda7a5c255b4595db9a4d9013046289a7676d15987
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16092 bytes
SHA-256: 6cf2dcc1d37e00b1ceca9476ff2164cdbbce1cff354340d626c7cde6975c8df6
font_02_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1