Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b3bed50dfc7e94…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 00:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a60390511544ae6a9f763d3938095d5 SHA-1: d06e5730a04f6d459e555bdbccab6df28d6202e2 SHA-256: d9b3bed50dfc7e94b6ef8ff389e4e430ad55e1bd1a3f5be79f7779bcb3ddee4d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=remote+presentasi+dengan+hp+android PDF link annotation
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/bijovuwodizobovukuma.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/70560492369.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090519480173499.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/zamazebozekazu.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/mudana.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/66569289793.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/38501309844.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/juwegoselisevetiwanofar.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kim71okblruj38etkig2dllb97/letagodo.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/veliviborupi.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xamotinurujupuduwavez.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f271c70709---21965036536.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614255a2afbc9---64378690533.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/sefijipetamuzikikujabe.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/gogalotarap.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161417648cee58---19145725373.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/nesofukogeferakawoxek.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/puzuxo.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/94566924915.pdfIn PDF document text
    • http://chayka-svg.ru/files/23625085316.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613969d57b299---2719253115.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fadub.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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 10840 bytes
SHA-256: b248a3f88dbe3c99be00a2bad6f7610704843880482d8ea20caf9900f004b1c5
font_01_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 18108 bytes
SHA-256: 8fa096f6df95d6414fcdcad6d1bb7ed0d226ead4b23b2c72a015b7234033ffbd
font_02_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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