Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8e0949430f06aa…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 22:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1834d0f7dba3b287bb683f0feb21a526 SHA-1: 7660498341319cbaac20852f4c4f7430ecd590e9 SHA-256: 8c8e0949430f06aa1ba13984259621548bbd45d69e7fa489fd3b93e0bc54bb47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=anglo+nubian+breed+society PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/aalk7belgnsrt0pubc33tmfn3v/mununokagujirovonem.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7897ed9c---58148931546.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbde56e3cd---tetugajotewavosu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3047e54cb8b0c98c3d1f44b0f1cb0caa/79041506726.pdfIn PDF document text
    • https://inifd.london/uploads/file/zudidivimupefewolaw.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c5464d34---soderokekupi.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/tafalusagerup.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921fbbd476f---bipekavawolefegixuwewibor.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/xebamapufexaromuxobeso.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17542d46f3---65962903456.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c991a220---70401548783.pdfIn PDF document text
    • http://93564497.com/userfiles/54293203737.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/mokobaraga.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607491a996f5b---33787321642.pdfIn PDF document text
    • http://indecomavo.pl/inc/vijewijitupudubuz.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5f3ad677---5564766188.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/li4trrt2spq54tfia0nfv2n9o4/79016839509.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/xifusovedu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zuteriwug.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbce0cc29c---39643596176.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b62ce66e6eb---58837111346.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c86020953---71946914053.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbf2d2a66---40251133259.pdfPDF link annotation
    • http://engineersclasses4competition.com/files/others/konoj.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b566d1a40c3---35799956156.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 18348 bytes
SHA-256: 1e96863da55aa72ab41399958b107c6294cfa7b956e591c41b08a015a1fcc7da
font_01_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 10880 bytes
SHA-256: 0f51ff3ce16afd986dfd96f99c1f734a71ddf0e5ccd478577d2531446108b202
font_02_sfnt_off0001383e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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