Malicious PDF — malware analysis report

Static analysis result for SHA-256 824e9c2b41fa6100…

MALICIOUS

PDF

79.4 KB Created: 2021-08-27 16:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e093eefc59a685e2ea517a629e546ee6 SHA-1: 67fc087805111d1aa4bd6512fe242127a725f1bc SHA-256: 824e9c2b41fa61000eef8a25339f53dd04dbe4836238b8fbde71ce8acf0cd86d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded links pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The presence of these links strongly suggests an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=icd+10+code+for+hypercalcemia PDF link annotation
    • http://duepassidalcentro.it/userfiles/files/nopewesivenujumejifem.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/ganawepaduv.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/fitenuxevimuzutexap.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8th7eiq8s35iurqsv3vimtipg6/pozis.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1426d7a12dbd8b2ae312ecb0ad79cd96/27288698984.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6346f2aa---62992147439.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/47764608109.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875aeb20dda---zugonepesapodozifuleliw.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/zufuwubibobusidim.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3fe4ed9a7cfe08ca48eb5ef002ce1d3e/66486297765.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/zukafatepefa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1051df2084---jekedesatezazowas.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a6c8d7ee1d6c4270aaa7c9b5f281ed0d/zubelasetigifafab.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/97034617159.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/167p989j0haih140m3blloo7ge/30703097731.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81f601bd3---65947291737.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/waxagukiv.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/goc06j3vt0jk15ratbu8fk5607/17060266978.pdfIn PDF document text
    • http://hms31.ru/img/file/79291402077.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c30bdb588aa---fuzumuguxiketago.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/11541417836.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9f41d618ad6eeb2b68e615362f20f97a/99567001487.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/sinadusabipad.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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 10756 bytes
SHA-256: 8f7776332d1e3f7c2ead89f1beba40ce1ec2bfbac56360667c882bc1eaf0f993
font_02_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 17300 bytes
SHA-256: e702f57a736994f1193ad46821678186a1b339291fbc6b00329024f1fda5a024

Open this report in the interactive analyzer, or submit your own file for analysis.