Malicious PDF — malware analysis report

Static analysis result for SHA-256 961f2ffbd6487077…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 21:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac130eb0bc1cd60ef582777947e72b85 SHA-1: 340d508f4b2c6f7739d2783a866d42afa8aac87d SHA-256: 961f2ffbd6487077c5b7482c6de04543c12528add69ccd78bb35e990c2658b7f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of compromised CMS upload storage further indicate a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0f6qcerut5195svcc53ojpqe52/65963574572.pdf In PDF document text
    • http://kozhencherrymtc.org/userfiles/file/rizewopagetodapijemujane.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/467381c2fafc491c50ce67319c8de54e/39446102342.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c39c9e26---36176970832.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/76813729232.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/25009970990.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/xeparesosememujog.pdfIn PDF document text
    • https://bliznacite.com/files/80666416457.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/28273056002.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/tulotejuratene.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/207a3f2800282b3a38290abcecb4ec04/xizubabubokovapidi.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/tirotanobanuwanoli.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/17156611510.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210505022445186.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/09564d43fe5ebd3e68ea5642b0f21210/20175976992.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7172ec119---93561131506.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8tm2b1ddpt0ekbc4chtcur7fpo/basojuseset.pdfIn PDF document text
    • https://parkettworld.com/upload/files/4485756402.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/vopopefowalusabupoloz.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e493813488---99832502755.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e485f23d---98813744312.pdfIn PDF document text
    • https://vitecolte.shop/file/45641697791.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/85944154763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bailin+love+gauge+field+theory+pdfPDF 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_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 16308 bytes
SHA-256: 03eedd89142a097f48cbd5a84628e5da897af864d2b713e4f1c7c8818541d08a
font_02_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10940 bytes
SHA-256: 15c5aa7862cc2ecd3034b7584a98529351894c3df039f8a0c1e8de97c1e481bf

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