Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4f7463eff01e7a…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 14:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea74545d5301e626a10a2c281e5afcf6 SHA-1: 65a40b9a9363474640f46dbe7353f5c84ec4d52d SHA-256: ca4f7463eff01e7ae353bd7aa16644884c2ade97bce44da8663dcd3c40b5ab25
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 ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://webinaris.org/ckfinder/userfiles/publics/files/37670430793.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/vekedubosezafofukiwal.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/85e9bpi9aq6n8i1uoqru7jcba5/50385868577.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad08638fb---23993145693.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/29961954101.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/785f24d4133020bdeb2ffa98e498517a/dibifoganuvikenabuv.pdf
    • https://aurorabersinar2.com/contents//files/sawevifonofuvuxipufid.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7423a719f---74525389338.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/begasugim.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f893af472---zepomozukakajabeg.pdf
    • https://andana.us/files/files/47178374135.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/247f41e762f9bbc063e03c2e35d9ea11/63946240379.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cb064aee---67488633468.pdf
    • https://elektrona.cz/files/file/20519144205.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/gonebunizatuzulijomari.pdf
    • http://polyalpan.hu/_user/file/nesezelukubalija.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4bfda15dab44fe00a9ae41aefc92f341/piwubudibakixuwavexi.pdf
    • http://bitite.lv/media/txt/122/file/zefegeguzos.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb776571828---53107163973.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/139412b61f4051d11a63faf6199f3c99/64779554493.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/2f78vpl2rlvi1f91fik31muuu4/nawarelivamaluguf.pdf
    • http://pampa.be/uploads/userfiles/files/seronijuji.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed167cb8---rojidafe.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc2a93c62---fiwefosimenujofizidaxil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=peasants+and+farmers+class+9+notes+pdf
    • 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_off0000e96e.bin
b2c927c36ae957b6d32c48fae3c7a5398eebd6e53585fefbac4652dc0ec4414d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16676 bytes
font_01_sfnt_off000114bf.bin
54083958f203f21308d6627aa1521f33ec6ff30610f877fdcb0e47c3828bd3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 10856 bytes
font_02_sfnt_off00012de3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 16792 bytes