Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1358a723a55745…

MALICIOUS

PDF

79.8 KB Created: 2021-08-13 13:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a0d6aa3fe3422d290b309196c1676f1d SHA-1: 7829198c658404255fd234fbf64962bf1c59d6a3 SHA-256: 3c1358a723a557451c871f0fcf5df2d4947d813a30736181603a4da09e0f8c82
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits multiple high-risk heuristics, including random URLs and links to compromised CMS uploads, strongly suggesting a malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature. The numerous embedded URLs likely serve as a link farm to direct users to malicious content or phishing pages, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • 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.
  • 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.
  • 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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qjmsjjukr8ntmhrfr787bspfq7/neluw.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/17esufnlr6045icgv4sajtfrs1/71469316831.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb648dc97---vokat.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/98611015898.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/wesuwunakepesalu.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/jedegiroke.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/29879356357.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/buzokolixanezifu.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/jalipoboxamugokab.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732dc1c8ffb---70380368672.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c022126fa7---dukakafatisunejulabekuta.pdfPDF link annotation
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/93278691883.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a07b5750c---35534567572.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/95821645428.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/33262834430.pdfIn PDF document text
    • http://waterreducer.cn/d/files/ponixiwabifal.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/54459882397.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/37250551890.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bosubemuxofo.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/wirarefefo.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16076255f2088b---soxivokavuze.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/1501893132.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096343e616f5---nekixipe.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/88300532116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ashes+cricket+2017+game+apkPDF 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_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 17028 bytes
SHA-256: 85ee09ad443b7e3af5eff34ee228dec3168a97bf1c4a8319a7e1c8166542aa17
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 10968 bytes
SHA-256: 861c56c778be783a447acce5acc478c38c96804bb53bcedd5e836535d3ad8c96

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