Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db5ac0c3dfacbb4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 07:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 637a27a258c151db7c6051a0b9e7ab5b SHA-1: 17c7bbdf7c5c23b4f1631c9065d85355dc5db116 SHA-256: 7db5ac0c3dfacbb459f40d8b0b6231dc9fdda1360f48d22f0ee08ff1bc2891b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the presence of many external links indicates a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=how+to+get+into+someone%27s+private+instagram+without+them+knowing PDF link annotation
    • https://izr.fr/files/5287009098.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/65574775273.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/zowalukuviwilebefuzis.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/taraluromu.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/37869527963.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/at8qta0qivd0v05147aatbkdn0/vaxonasifukurenideg.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613add260d09b---77635891138.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/3573402239.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/62562298317.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109061422198779.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wajevuvafigulib.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/19259651301.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/vegudujesidiredidad.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/12809564592.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/28272471329.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/23772484838.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/12044572708.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/ratifitusovuzefezus.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e4311f4e---89403317128.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/57826011578.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/30571974930.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be00838619---fewusefojosixapuwuji.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/14273413948.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/72080690914.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_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 11024 bytes
SHA-256: 3752788f3093ed5d0c9d2f2488e4782b470f59e10765e8078caec45430d20252
font_02_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 17152 bytes
SHA-256: 330311296523b2da54acc7d9552286fe4a478e36ca36c5542fcead8e1ba45eb8

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