Malicious PDF — malware analysis report

Static analysis result for SHA-256 3749fdf66a0dc247…

MALICIOUS

PDF

79.1 KB Created: 2021-07-06 20:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf126ee3f3855d313dc5c43e8bbdfdaa SHA-1: a3c77ccd0e289b7f4df6ddbf7bacca5c0af9efd8 SHA-256: 3749fdf66a0dc247396bc37007f3769dee102999ca21d0201017242f8105e336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites that host other PDF files. The presence of numerous links to potentially malicious content suggests an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becb9b481b6---govigokigamaluzararaxaleb.pdf In PDF document text
    • http://pogservice.ru/userfiles/file/99505332166.pdfIn PDF document text
    • http://amdind.com/userfiles/file/54162037101.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/38451239586.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/38e84d3ab6bff072ec35648a53a8611f/93619188083.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/81077415451.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4341acb3ddbc7d8cf01f63f156c5d094/lumexuwagopinusegewi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091a02022592---79936156250.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/6272141544.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5826022f---kevajenavepu.pdfIn PDF document text
    • http://bjjiffy.com/upload/22848035289.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/xawanivagomalugowiti.pdfIn PDF document text
    • http://yuha.be/_files/file/732721251.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607775bc7d378.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/76901198140.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/93027729682.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h398nck0qu4jrtrisrqpckgdl0/xixavetepofofev.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/131554421172.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/56109194109.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wukexetevaxuxe.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/48abugldnil20lfhoilh5poufv/33293809135.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160756eb3c7456---27359331064.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609dd90e885cb---nofolerol.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/muwivireneburimepo.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/volurimojidet.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24296da7b---98500316928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=planes+of+symmetry+of+a+cuboidPDF 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_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 17092 bytes
SHA-256: 1165701b83a70ed79758ade5530459d30df85081220ffce4893ec59b578c9c37
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10992 bytes
SHA-256: 04694f8cb57a8b29aca5542f970b033eb574b3446fd6e2ef74fabe737ba2c58d