Malicious PDF — malware analysis report

Static analysis result for SHA-256 1232819ca8720e98…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 08:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b9c52ff75e0329a15b6f63077806e143 SHA-1: a95e68ad747c69e0333cff65f087a002e4f6ef63 SHA-256: 1232819ca8720e98d5481f144538a6c6c099c78fd21fb9899fe8a95d162637ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079efbaf0858---zulitupewitefav.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606facc827c3d---92234114748.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/majisomezire.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/liwonufikoraborabativamud.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/perutexaborupijugo.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/79518219624.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6u3m6ksmsd7ra26gud6s6fti6/50866494119.pdfIn PDF document text
    • https://mmszke.hu/files/file/63886344166.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bc10a61f---xezamuderufotudesuga.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lolumarep.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/41mfn5r7t1n81hqpvttdpv7uih/dunutuzejupobezutuxugora.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e8d59676---xularibunovilitote.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd57d9975---pezilogop.pdfIn PDF document text
    • https://digireg.pl/upload/53365257624.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da653d0de9---1001403124.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/27888e9676a270af6fad6954344ede68/rumix.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a1b2f63f---jemeserekidodixogofive.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/69870125873.pdfIn PDF document text
    • http://kotolantopeni.cz/file/wirotetovobarekob.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/poraxuwunojadexenijek.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2686463b5---tudewuparetovegezazavox.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/kagufutenugimatizi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hp9tli1b8t3k9fpvc7f8to8c35/xodevivarananebam.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5492da45fc---63524830247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=new+cathedral+cemetaryPDF 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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 18452 bytes
SHA-256: 20502add155fe194445bcc81f85d49140adc3430a7b32bd30bb383590c571d70
font_01_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 10328 bytes
SHA-256: 47db355a343d6558f64e1fff74a319f651c553613aad6146ba96737d8a765412