Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e3b5b04364d795…

MALICIOUS

PDF

86.8 KB Created: 2021-07-24 06:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 017bdc47a5b166766d82e8d495ecd286 SHA-1: eef427b49c824d96e3538d03d575a24becea12e4 SHA-256: 74e3b5b04364d795316e959307f133480b1bc5ac20a54d77180d8f6f514847f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, potentially leading to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://castel.ro/userfiles/file/4367790788.pdf In PDF document text
    • https://gw21.ch/uploads/userfiles/file/sorafumor.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/31770699101.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cce12394fa---goxuvoxasinoxoforus.pdfIn PDF document text
    • https://codecs.ro/images/file/marem.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624093825.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/b76t0pns8cai7ma4qujqon0l15/sulubedudixobo.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/gubiguvedarekisuvi.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/74248728358.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/99095321445.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/84144e99dcd3ba604bb9ed27c950f642/88775077268.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843e8629a13---94244154110.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/26970972709.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/26acd1191b6d9b3284b7e3d6395130b0/69329105433.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6444a79fd773b1ce1a047e70ce9d8871/75120713540.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/89986880329.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c0633f4c945---tevefarudojed.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716db703bd---9598431649.pdfIn PDF document text
    • http://cwesp.biz/upload/file/38159907826.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2998038d7d---99411935250.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dd4661924---61451643462.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/gopelu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c0a4df95---10280838484.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4578b4e6ec---92060926532.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/86531851026.pdfIn PDF document text
    • http://aps-mes.com/files/file/12518327129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+write+a+business+law+case+studyPDF 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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 10796 bytes
SHA-256: 8efc7c44d3fe31c9dcae4f384703b18fb61bdd959cdf125cdcb67e5c7b4cbe88
font_02_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 17460 bytes
SHA-256: f1a0d353cadc3472fe0526c8c9fd44d9a81c8102a2a01b223d5f04df6c2a6d10