Malicious PDF — malware analysis report

Static analysis result for SHA-256 99421a555b03d927…

MALICIOUS

PDF

86.3 KB Created: 2021-08-08 23:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d514854e2fd893cdbbad4505d3805cc2 SHA-1: 114e6b1a392a7426f13afd21267a9f5a056152bd SHA-256: 99421a555b03d927ef2365d380e91e8e829ddcb1e2f100c4842ee12fc52498f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to lure users into downloading further malware or engaging in phishing activities. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=archery+mod+apk+unlimited+money PDF link annotation
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/56ccea4191e9d395c4c66677a1a8f641/gujivuwafekesufi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaac87d59a---43476884302.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/m8o5eenkdn7fsogfv86cs605gv/wofipomeba.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427974d765---foxamigamoniboxinew.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb00bc1291---58840735703.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/55726353615.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gaduxifarune.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/731b14ef64052a276a346c1ad72bf043/wakazigemu.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/72793898103.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e12a987a14e772d19f5c7b292115cd34/87982950371.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/35041377029.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/20567705253.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/82548057635.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9884b81aa---18889629951.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/jevinalabexi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/010d29332c9a8d052e5f86b071f5ce12/75633971625.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c377897c163---zajuw.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef7fa904d---3274644958.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/38038443320.pdfIn PDF document text
    • https://flyags.com/editorResources/file///tamadaziwefonin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c1443aef---89895044554.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/97292380060.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ae194b0553a47418429f2ec34ad018d3/55693652412.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_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 17264 bytes
SHA-256: 1f995a34195e9ebe5ef5e3aa72340a848bec1b52b1e9f73b7323e8cbcae8c5b7
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 10896 bytes
SHA-256: d7b5ce7d907867811bb2a2c9c0d1b0f3aab84c125de67ecd72f4b041c847159d

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