Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a0b5272036cd67…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 18:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b04899095f80db54b7bfdf7fe311fc41 SHA-1: 6eb7dd8f39064e6a62fe122498b8007679900780 SHA-256: 89a0b5272036cd673339aec2c0976068ef6e32addadf3266c68a2c82dfe70ca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e445bf618---kafozevekewasudenubugiw.pdf In PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/69288447815.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/7289009844.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210911050820633290c0our.pdfIn PDF document text
    • http://lenaoyunlar.net/calisma2/files/uploads/kixeniger.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/regaro.pdfIn PDF document text
    • http://apple888.vn/luutru/files/wexuxoxadunimexerox.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16139946bb3da1---99264172064.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/68497312765.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/303196266.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/todoxuzur.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/xixakojabatanebi.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/77308716782.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/63192740978.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/jefukabokutawufuvefis.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/89432875947.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/zonubolinafaravewovuku.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/41305152496.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/wikubuxupidazuderife.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/23097965520.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/kewijagaronix.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/03927a43e67b8d14dc93c51e633b87d9/78552471740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=calibrate+touch+screen+on+androidPDF link annotation
    • 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_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10736 bytes
SHA-256: 3fb426242a3532614114971ee4ced2232c6a5c15bcc9f49c7e2e4b505b04189d
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 18308 bytes
SHA-256: ad9999b024a660449861631838eeca1f75b39428e49933afe145788bda013d6d
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1