Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc87186bae7e82a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 20:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 500d08cec855fe58572ceef9484a70c0 SHA-1: 366b7eb6233eb240065afa2fb16724b427e1f0d4 SHA-256: acc87186bae7e82aa02f023a3145a81026e22dcee7db3a6c5fd02309a62864ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate it functions as a link farm, with a high ML classifier score and ClamAV detection confirming malicious intent. The primary goal appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/138475dc2fd7a56be905f40d1818552a/doxotevijomeretivabi.pdf In PDF document text
    • http://futboltotal.net/images/files/8079897975.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/fotakimofifaxufuzulibin.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba04650e807---6375795341.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3fe4ae6f59016a1817223b095167d520/bidikigafatadukaguso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d991dca601---gitopudawu.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/ferabubawepopejafus.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zuvorokotuwexa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089639f824f6---59751360416.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/92677691715.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc2dca36a---73913917739.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nujimufa.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963da7a627a---jasimurajiwuwixemurokuzev.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/55686773514.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefc88e9d5---82490367389.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5c4c5cfc9006d36b6bcad6904de17835/dixizumorafikezevatozix.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/rawelawikibilase.pdfIn PDF document text
    • http://word.mn/uploads/assets/33136137837.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/56221180979.pdfIn PDF document text
    • http://garderoba.sk/images/_file/selitojiwuje.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/96392240935.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/xukivuxamigosimag.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/42589adc208fc8e31dad57d4f5d8d21b/jumag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=math+functions+in+javascript+pdfPDF 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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 18220 bytes
SHA-256: 52bc920536642775b161c6fb9f753b334bc6c834e9b3fa8607925dab0964b1b1
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 10828 bytes
SHA-256: b250067c3a2f14ad4845da19645ca8177856aa376b46724db385ab0ee16d2364
font_02_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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