Malicious PDF — malware analysis report

Static analysis result for SHA-256 665a37522122e5f9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 01:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0163ec6286dc5e8527cc90706a55c992 SHA-1: 6eb0cfbb598ce7ce7ba735218448773615ce690a SHA-256: 665a37522122e5f9623e2c9f6ae67f3ffa84d4cf48683e2957494a7d318b0499
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a link farm and instructs the user to disable security software, a common tactic for facilitating further malicious activity. The presence of external URIs and a compromised CMS upload link suggests the document is designed to lead the user to a malicious payload or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 https://allytemp.ru/uplcv?utm_term=android+disable+firewall PDF link annotation
    • https://nazrabilisim.com/calisma2/files/uploads/94404499083.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d9bd98b6---14275157770.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/mezaguvupifetisite.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8bec6c89---49640930100.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/gurebiwepu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cf6aade1ecab72695ec7740eb650c0de/91004172371.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/dusironetutifi.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/mozojedetudupolagubanoz.pdfIn PDF document text
    • http://xycrusher.com/d/files/23355432562.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kanedidobalazolemotoxa.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/zasadanatokudoxub.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tamumusolanusefozixefafir.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/jeriworuk.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/gimewowupeta.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/89768605132.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/gumidoba.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/boniwuvotexedogosaveta.pdfIn PDF document text
    • http://esistore.com/userfiles/file/15363489062.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mn6ekgfk237kbo8khaphdloaks/bewuginerorub.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kevotifabavunenob.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/18594885546.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/32528137323.pdfIn PDF document text
    • https://lapdonline.org/file/41107037548.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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 10456 bytes
SHA-256: 54af09773cdcebbbe3d6cbd7c2dbc6e1659a8178ee5978d0ffec1934e4a3615c
font_01_sfnt_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 15616 bytes
SHA-256: 01ac8e878d9796a1fe598a1f5a53890470cb16cac46eb0ff806aa069cd9d49a3

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