Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87c68b29baadd32…

MALICIOUS

PDF

82.2 KB Created: 2021-10-19 16:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 86df8c50bd27caf3f0bf3af939282332 SHA-1: 6316e98fcc36e12b5f522608384091f982e7212d SHA-256: a87c68b29baadd321073e470390dbde0bbbc36785642b043cb91eecc12e2fa8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to facilitate the download of further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://teewer.mn/ckfinder/userfiles/files/36925210776.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616e5fafd8aa4---32909027278.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1616d9970b073d---3014280465.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149641f2bfa2---30580616977.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fb364f1e160780773046fee38d6467a3/zolexu.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/ledinuxawovurodaxif.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/98635038090.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ccc306db50e6de68270dfd9f9c6be34d/xevojaluzolagevedu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/05974f8a0ce7419976c7b95c5b9949a4/23592796288.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/50761074474.pdfIn PDF document text
    • https://online-wums.com/files/files/17880272943.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/7790937078.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/lumijokabanorozid.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/pejovedubebisotapup.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/wububebiloxoniw.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/bokumedazelunafik.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1616ea6ef5de25---tubobujuza.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lamivub.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/022a0eb036e7da59d2948dabe3cb1b29/doseviwojipezi.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/winedibirasati.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/64802411116.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/xaxakapigatafet.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=mission+impossible+4+movie+download+in+hindi+480pPDF 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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 17256 bytes
SHA-256: ca3bdae5f74ad2944903d010521660240dd0458f9752a2077fd3c9ee4b82df5a
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 11152 bytes
SHA-256: 9d6e580d5fec73c224fa5b13f32857fbd9af734a5f29c027d7c37ea6d4b41c30

Open this report in the interactive analyzer, or submit your own file for analysis.