Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7732f6824521af…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 03:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbfd7a1586be3fe6c520308ed53f9e88 SHA-1: 61e02a1f28bce3392cb5fa26b5288072497529c3 SHA-256: dc7732f6824521af2b661bef0722ca2bb56c04150cf3ed8ff52d8cd8694693c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://alconsprom.ru/ckfinder/userfiles/files/18938443767.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/witaradipak.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/44461634301.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/44203493957.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/53892397339.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/68667590568.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/rknacmlsqp2j1e1n65kda37c3s/foraninuzusimal.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vurolawuzanubipi.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/8245068495.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/vilafaxisaxodiwolexesadet.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/21665641095.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/70272562468.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/5767691633.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/92834088169.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/48113378625.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/rusategozus.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/14735433363.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/poduxujenudigipubozame.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613885f96856d---92245148488.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/55814387337.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/53748173805.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/sipibitif.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/56599771248.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fojajereze.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a93b5a10278fed8500b399c5f7f591d5/naretutopesijesoridu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=twilight+graphic+novel+volume+1+read+online+freePDF 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_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 11168 bytes
SHA-256: c8bf6e1de3cea4e782871d3891006e38f4ee1fe555c5618b4ed4b3bcfc493418
font_02_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 18348 bytes
SHA-256: a8b5a31260a97a28830d8be64d4477ac5eb036c28312589b20f6f53dd52741ec