Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe48b97f4f853afe…

MALICIOUS

PDF

88.5 KB Created: 2021-07-06 08:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8244792fcccb2f7194544b8cf0384527 SHA-1: b4f891b981a96f47391eaadf8afa0dfa08898708 SHA-256: fe48b97f4f853afed562a133d26962273e9e11d4535eb699cf6dabd25950c8c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the heuristic firings point towards a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=second+conditional+using+were PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/pafepuxuwesixugumawudube.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fbf50693---71661048176.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/zutimekoke.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/82613938496.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a41ea0d2---gapivedulakofarumezuba.pdfIn PDF document text
    • https://limsurdua.com/contents//files/3861016089.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/97483719191.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e6875b0325dd4ba6148f41da7f0d62fb/28871627956.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/sitajuwokanewupijuxamega.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/83627469191.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/famabovobigilim.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/44863565880.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n4p0lqdupjhkuu6oktov6b8iou/ginud.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3350cc421---69621107301.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6c15bf00---47649619681.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/wiruboxasowa.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01eb31b21---85582627222.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c480a465e3f---94242211583.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/71243873732.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609baeaac5775---jupitupivubivomuzukew.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a54e0abe9b2b27cb75edc36b4db42fc6/35811747796.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d2a65ac3---tupupijiguvolugozesade.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b4hldaoggkao0hdakmaq61bc12/60876585097.pdfIn PDF document text
    • 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_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 10804 bytes
SHA-256: 7a458fc8d717804fa521eab86d1f7b5d88c6222da3861e871e92e88185f2775b
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 17020 bytes
SHA-256: 2acab8f31faf398a6a89ebaa01c428a2a77c9753481906ed1ffefa54a15de6fd

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