Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b72633295f2b32…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 00:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 750d2abe835361c173292aace18c3ac4 SHA-1: 0839cbc50000c350961dc7b80ab776ed3eddf0f6 SHA-256: 61b72633295f2b32857bbd35a31c0d928bba3e3936b7c73f6ec71b5fad7abd2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of external URIs and the overall structure suggest it is designed to redirect users to potentially harmful content, likely phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=algebraic+structures+pdf PDF link annotation
    • http://mini-garden.ru/userfiles/file/71146273167.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a7999bdaaf0e12b4c6bbba9e2209edde/nasixa.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/46703963237.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/22559271573.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/fiwudotoxabilefiwuguger.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/98440119951.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b893be1d6c8---88934855660.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c252341d978---zowerumogogomu.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/93068032283.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/butumenagitifimudedasonig.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/vedevesem.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/64397119911.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210527104612.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e30d024b9---28977132460.pdfIn PDF document text
    • https://moolans.com/uploads/files/vemukepufajesojezesub.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202107272329123552.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c15b77cc228---sasomo.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/91997337519.pdfIn PDF document text
    • http://capri.lt/userfiles/files/62562482697.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zowanixuxidogoli.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/3900543913.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/lelegux.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/16862655005.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_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 18136 bytes
SHA-256: 1df589c5d2660ca0c6c6a2954cf700887d7c6987664072fd82e094c3cf3c6f11
font_01_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 10792 bytes
SHA-256: dda322effdbb7c8fb813de2df89de7544df401f2e42814946a2e14f97f3d69f7
font_02_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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