Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da8feac05ea00e4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 12:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 334bf005ca55b894f18955cf44d52f88 SHA-1: b609346701ed0d5fa5f993eda7788aa970e8fb35 SHA-256: 7da8feac05ea00e481f9b6ffd9019f7b23a812a7c0cd053b60c442e1686b6454
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The URLs are presented as a link farm, with one example suggesting a lure for downloading software. This indicates the PDF is likely a phishing or malware distribution document, possibly using JavaScript to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=download+dragon+ball+kakarot+apk PDF link annotation
    • https://premium-house.uz/images/file/41790098227.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/41652018073.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/xebifakomazi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ec5e1b838dee8c1ede52681c18372563/xoxole.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/82747197465.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/48850609349.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/31916860297.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/pezipu.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/68774615090.pdfIn PDF document text
    • https://tele-video.ru/upload/files/sujeburewi.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/99968061467.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/39415781028.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613520f9dc799.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/lisewodab.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406670cdfc8---zaduximovopito.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/93430600757.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/12122662693.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/lanafixu.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/vokorige.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd3018c24---51046475102.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/66035642569.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/75833235236.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/85876490164.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/81029969632.pdfIn PDF document text
    • http://holzbau-napetschnig.at/fogidaledulimer.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_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 17984 bytes
SHA-256: ab934006643ecff95aebce694387612ea6fd7e92a5bef2ac7eed0bed76f12b99
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10492 bytes
SHA-256: 34fa2d146b2324dd3f3f85ec05c4242cdf1a5b435f9cf7e750bedf8a1b05061a