Malicious PDF — malware analysis report

Static analysis result for SHA-256 f061ad0b7842f7d6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 06:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 596eb2f10f8198dcffd1aea840a45a6b SHA-1: db8779ccac52e1c33c50342d4f7dd9680e71d7b9 SHA-256: f061ad0b7842f7d6f7a4a3758f701b9be54c3289dea7f5b6319d6818c5a1b6d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://immo-cjeanpaul.lu/userfiles/files/79721795417.pdf In PDF document text
    • http://huonglonghotel.com/uploads/image/files/sevarasovuvevunolozepena.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/jifebap.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/71412058715.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/33532777912.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/43847438290.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/94758045461.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/42826979937.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kanizadurobezorasotoxoru.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bfcdd8be268a11ba09e0097c5ac5224b/60637073166.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/xires.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/xefutixi.pdfIn PDF document text
    • http://hingliltd.com/userfiles/93644224027.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/nudeva.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/vajutijumejokowirag.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/46661413608.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/4644406248.pdfIn PDF document text
    • http://bociany.sk/media/file/buzirajulirobipavatowukel.pdfIn PDF document text
    • http://360global.ca/userfiles/file/mekafol.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/19513688731.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5e7b9ae5---tolipawumawi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a100e06367---vuguguwasituzesufif.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/dalemeteli.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/nagibidozolakok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mi+themes+premium+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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 10432 bytes
SHA-256: ba75a2fc242756625c45b21ff9ef0fa326259f22a143b9ba0994ed9fdcc61043
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 22256 bytes
SHA-256: 3577885616f74a7b681942c89477b4f460a10fd13bee87cc5320860b8e41ff4d
font_02_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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