Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a55e8a0a6d551a…

MALICIOUS

PDF

79.7 KB Created: 2021-08-15 03:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7889a50157b8a2e7a1e26a92ecaade83 SHA-1: 2c34a87a35c84e5b87626fb58b4e6e7eccccdae9 SHA-256: d8a55e8a0a6d551ac74e5a8ae6045034d8a65d650d630b8a3e34f3b3feb72ec9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cambridge+igcse+pe+textbook+pdf PDF link annotation
    • http://thaoduocquyhiem.com/userfiles/image/file/zepokadatezipepubagojex.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210719041829_vcmr5j.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/35138020140.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/7247322087.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/dumedadel.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/934ce9c25093bf09b53b8622162e1a28/lexilojigipuj.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/zikerokewasamudunadevifo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3a4c736867c656ff62fd745066ff141a/retiri.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/gogewur.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a346911e279---96503058790.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/c85lq0ja4he3n6fal5ch2tefv2/materetojoborakogokix.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/pegapizofif.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zuzoj.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/zinuje.pdfIn PDF document text
    • http://tipiland.net/upload/file/nidowidujaruk.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c0b80c19c---robesape.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d12e67984---vupake.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/29902720608.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/hfr2vuaict1j8aigtr4dapse6s/senejisomeko.pdfIn PDF document text
    • https://nevisnews.com/userfiles/59764477093.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921f0d59d52---nogaxazo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2622e5c3---52420891311.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/20408140304.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/xorulababenene.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/melajexuvewiwarejur.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_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 16900 bytes
SHA-256: 20a5ca4bc8015b6abaf4e6da1a9460d211ba32609061a9b987b9f85052db01ac
font_01_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 11176 bytes
SHA-256: d520df4859dbe29d6b6a1a292bc6af516422b29494a56686bd22c773cec9e922

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