Malicious PDF — malware analysis report

Static analysis result for SHA-256 c556033c099a9f21…

MALICIOUS

PDF

95.5 KB Created: 2021-06-29 13:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6ac50d68b74b11365d25475e43d506f SHA-1: a8e0b9af7770503f7685151e24b0bd0f9652e0ae SHA-256: c556033c099a9f21556595cea892c85027ee7094bbb87431290720f9499e7702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious content, potentially for phishing or malware distribution. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.allatpatikapecs.hu/images/file/nuduxijupizo.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d916e391---pifijekediwo.pdf
    • http://vladjurnalist.ru/archive/file/rebikodadopivapupofaberot.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/64291870733.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/31041363d8867feae48b7afd2b9496a8/99684291238.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f861ee99c1---9098959700.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b332e94e31---87153830036.pdf
    • https://thefencedocumentary.com/adminfiles/file/gubejavurav.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xuzorozu.pdf
    • http://king-ber.com/UploadFiles/file/20210619203706342.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210629_A66C64A50BB44911.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/brqe8cqgv2v7emm9g7k4tdd6k4/xuzojalituxozutilafu.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d272af89c---ronegofej.pdf
    • http://tvkinter.com/file_media/file_image/file/gejofixawadola.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607252df47221---44697850441.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085688d6a63f---niberomilig.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hvv8n048qo9jd4o7dbpc7as216/33581169016.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/os3uus4kpehbqikc7vkjntlpt1/xubawikozebobikab.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c97733ed---225175108.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89dd36176---82267604895.pdf
    • http://feynburg-uhren.de/uploads/kiputirozisakonagewawap.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/76955088845.pdf
    • http://bendhorseride.com/userfiles/file/48767048479.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8fbtikk8r2q8qcqoj7odgaapmb/23546340931.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6fa085c2---nugovuzetovizog.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dd9596d0e846bef3de97c72110a3753e/62691821884.pdf
    • http://computerdoki.hu/user/file/85008469300.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/75538932658.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fix+scratches+on+wii+disc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 16792 bytes
font_01_sfnt_off000129f4.bin
7275c9e9ec87535d7e056ba3660448246779c1b936da9b079dd3063f7bf3177c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 17444 bytes
font_02_sfnt_off000157ce.bin
39c99c858d67fd77647eb68be9fee3f37961e1fe9c0eb4e0ef9c35a2c57f9ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157CE 10704 bytes

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