Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec37d5db8df6338…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 08:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6128e63f8823eaa64750e8c9f2fe5641 SHA-1: 9e1b235d69e5b3b97ebad3f814e93369e010ed91 SHA-256: 6ec37d5db8df633814b29a57efc2468263c3f9bf6998e86380f670a6ee9ee88a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d1eb4a0b---bukawebukisag.pdf In PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/92978627752.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccb30c306---944865922.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/40361020642.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c46bc88b0cb847a56dd3c584421d1c8e/36719839020.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/12029552361.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/88922492343.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/zilokasixabazolumak.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/betefuzet.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109090227154909.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/63625891156.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kibiba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138faa649584---72048769147.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/47174438901.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/luvobavisezajibapopumere.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/38607127049.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/naxufusopezokegoxatafote.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k51s4h2on5hbhagg6kk0nktm3r/gotulujevuxosibakadowexiz.pdfIn PDF document text
    • http://safarang.com/basefile/files/7706774150.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210905143639.pdfIn PDF document text
    • http://csp.hu/editor_up/buziwemavudavamoxegopegax.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210906061452.pdfIn PDF document text
    • http://vhz.cz/user-files/giterufej.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/redagedakomasivim.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zulivajina.pdfIn PDF document text
    • https://blv.by/upload/editor/files/xuwirisebutikoxabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=metro+2033+fling+trainerPDF 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_off0000c384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC384 18756 bytes
SHA-256: 5e8bcd9310664275f5ef2b5c5060322cd90a97cb68a36234649a1ad90fed53f8
font_01_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 10628 bytes
SHA-256: aad430ec1bf68c340ccb9bef3db1965aeefd027ad58248134b9549fe7a98867d
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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