Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80110d4a0ba3d11…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 05:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f3c1e27ea4092163147c200c5f36dbda SHA-1: 438a9b6e823902bc448783e698e4a72dda1c2191 SHA-256: a80110d4a0ba3d11f0986c388d80112836c35cdcde14fb1b2c92457a9f95faa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, suggest it functions as a link farm. These links likely lead to further malicious content or phishing sites, aiming to deceive users or distribute additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=medium+meaning+in+art PDF link annotation
    • http://runbo.net/upfiles/files/16312284922895.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2a50606e---1218108987.pdfIn PDF document text
    • http://activesites.atiks.org/files/34611721902.pdfIn PDF document text
    • http://www.bash.cl/media/file/gerizanif.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/figesikodiven.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/titulojazo.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/sobafo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/de48958d2f778901c1866d3b7ac89d62/dujonobojopifubikezasa.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/dasurerodenidofizufota.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/wipera.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/pajat.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/gatojepog.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/35491681890.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/nidepudilupub.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614684c51c924---77864398473.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/sawufimiwuri.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/90192667784.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/17742846789.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/93716377548.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/54046751196.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/setomibefubodezawiwa.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/pebukurisifikesedilaga.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/lipopelak.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/71900094220.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_off0000af19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF19 10348 bytes
SHA-256: 88cb9265c4063f5ad25d8f8a111af8566c0d7a8ed6e2a4f11b26993de72f0dc0
font_01_sfnt_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 14716 bytes
SHA-256: f1d3d625d258ae7fdbcacafc5db17acfe101e1fea47163016b6c457c294bfe79
font_02_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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