Malicious PDF — malware analysis report

Static analysis result for SHA-256 2833127cdef4a764…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 08:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 346001848caf7bcc0bcb32d2bc19a187 SHA-1: 44399f9f8a86fee1923b5d0f03e0b9b9f2436590 SHA-256: 2833127cdef4a7643c90c3195aeb6a2fd3afbe1eb50840ec354003d8917c7337
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://consulcongress.it/uploads/assets/file/16758287356.pdf In PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/13285408111.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/danajomuditafotijimo.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/matakukir.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o6pkhrlrs1u2oh33mkvviocav6/wukavon.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/21fd8f2fcd08fea6cf11130d525ef279/60422414341.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/wupamaxabilikazazikul.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/fepifegosabekuxorere.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/54109349391.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/61160492886.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/mefewed.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/romivaxajuridilafope.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/jijewivisajizuned.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/90742754088.pdfIn PDF document text
    • http://merwepizza.com/upload/file/8978549406.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dogozovuwes.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/95210492778.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/60921504748.pdfIn PDF document text
    • https://dogodanang.vn/uploads/image/files/56032467130.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/70999580128.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/bedoxafoz.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613427ed416fd---murapaniwovegulizinamepik.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/vewuw.pdfIn PDF document text
    • http://c-six.it/userfiles/files/najedonazenipenivuv.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/24219961304.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210920_D6D677AF7370AEAD.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+change+the+headphone+setting+on+my+androidPDF 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_off0000b2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 16308 bytes
SHA-256: b090b164ce85f3c36699b23f49a1d66105671adb3eb7f71e0dc613c1629345ff
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 11104 bytes
SHA-256: b34b77e9db6ad9fefea4f22816e3d8d7a2752cc4c2b9b5297e21b998615262f3

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