Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59184b633725f28…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 02:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81b904baf2fdfd9a32f041a25eb53b5b SHA-1: ab85f78b8d3bdfb798c2161528075d99b819f9c1 SHA-256: b59184b633725f280f94758474184222dd6f3039d15507e9375d3655d5c5fe8e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS platforms. Embedded JavaScript streams are also present, suggesting potential for further malicious actions like phishing or payload delivery. The presence of multiple external links, including those on disposable or compromised hosting, strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=how+much+to+unlock+an+iphone+11 PDF link annotation
    • http://eros-arena.name/eros/userfiles/file/zopevatoposa.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/24900550769.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3091eca3d---poweloko.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/puguzutew.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/49966381999.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/20864848125.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837f7dcc04---49802618852.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/79519746567.pdfIn PDF document text
    • https://allianztc.ro/files/file/kelinasuzimibi.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/46379609267.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/91528013440.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/53701517014.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/24444701798.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/gobivigino.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/40670200329.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/vukekejajijud.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/modezilufubirasedi.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/kemisavufekuzesudamoziga.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/96629808076.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/nemodijuvi.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/53418142237.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/97042275616.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/godakuxoxugodox.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/96580619213.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/2025968865.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_off0000b1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D6 14732 bytes
SHA-256: 8bb4fec00d2d03baaca2f1ead6c85d507df9b94346b941b0269653fa4a0f7ee8
font_01_sfnt_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 10692 bytes
SHA-256: 2f2cac2bd436dc704019c288e35909aeb9b2a68312619c3559420157ea8b6199

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