Malicious PDF — malware analysis report

Static analysis result for SHA-256 031cb194585e52c9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 23:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03f256c236f4addc19338ea2b8f6655b SHA-1: 9ad9ba5e97b245166dd331aea4f4f00e047dda48 SHA-256: 031cb194585e52c9760b18e977c417700137dd363974fae81b0d7de50fc8bb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution vector. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to lure users to malicious content. No scripts were extracted, but the extensive use of external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://queure.ru/uplcv?utm_term=the+gist+magazine+pdf+free+download PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bd131cb3c57717c23f562273f45d9fed/87626944416.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2a63aa5f76332b5e42061ef61c4455a2/78229174942.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rujufijalogezazemox.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/22303837660.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/jamezemusuvupi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733f620e32e---20367501922.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e3086a486c98a0ce2a596d58daf81386/rutem.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d14eb939afca05fe6a79aeb0127c7af9/dubijerupelewabamedudabup.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/tapebepemu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/dopanix.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/tapaxul.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/95125292417.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/gefogusejubifapo.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/zubezekafaludusefatirap.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/907b9175fe0171791205c0baebd32acf/95526763571.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d843780e9---fizijiduwel.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071739890fcb---xerinerodupibofolifobavuv.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062302122881.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/gakipepov.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf056327dc---6185451494.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210707011724.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9b48db2b6fa522645cb66df08f094c09/ribaniku.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/32941053993.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_off0000c08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 17192 bytes
SHA-256: 34d47395574e75162dd54baa94bd971f5abc1f74e1d1a98028d3ce930ab0f063
font_02_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 11056 bytes
SHA-256: f0dfacdbe62204ef010d894d7a5ac5968161ffff570a2d15a4ee258ce289a768

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