Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cc1b6c70417046…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 12:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 551dabdbf2bdd9af4f9e923354c0c951 SHA-1: eec4bc797c1869fa82202ecb7504e34e8503fec5 SHA-256: 37cc1b6c70417046d3ef7ead06d5e8bcb771aa14b930f47ff889d5707de911b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The primary purpose appears to be directing users to potentially malicious content through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://fontanarosaserigrafia.it/userfiles/file/17630563120.pdf In PDF document text
    • http://3dtechgroup.com/uploads/image/files/tigexedoxeno.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/jalipozezaxemuki.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/86291955075.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/10753313743.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751a28da26e---72213210712.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608697bed6880---27793601159.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nosewefolanupugorilodewe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a42384ec261---18742698850.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a063ca14f441d7e44fb4d2559938725f/bomufide.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/28393932350.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/vigamalowumawig.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/lozikedusizifujewevazoju.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/dozarolatofelin.pdfIn PDF document text
    • http://soc-in.com/data/media/files/24599951072.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/vugegog.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84c00338c---90538340583.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9cab23262476670b9ce17506fa8e9cc5/30916227346.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760e43ba53---81002798994.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/najumawegonorufer.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/77157940876.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/lorezekebekunenatezag.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/88887434363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=logical+reasoning+sample+questions+pdfPDF 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_off0000c26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 16756 bytes
SHA-256: f96ca8ba8590db17a0983c172ea141d5de0511008a15b6662ab4decab7809253
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 11168 bytes
SHA-256: e52060685b2aa9df1c92fb20cc705e5a140bafb1006e404190a20d12ee76cb2a
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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