Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da669865a6301c1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 23:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a125e41dc70f58542300c816c374b5f SHA-1: aa9ba7a7467ddf579b64c8a63ea27b50037ba702 SHA-256: 7da669865a6301c16442fff1dc362d70f282c38faae22a5af417f7dfff035826
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation, likely to direct users to malicious downloads. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=free+download+guitar+pro+6+full+version+for+android PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7541e1d0961bd486d2af70d2efa80073/dikalifubom.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f17c10fe---1392020399.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/diletimilozizobepi.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/96804737353.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/27629299228.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/sitomubizunededajo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/23095803893.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/16396850037.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nelofimajuwevipok.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613303df6d918---21050317625.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/nexapugalumifugu.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/volivazetapujevibisiwukif.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/48532888858.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/maserutigekowokotoveliw.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/30819849948.pdfIn PDF document text
    • http://christopherdallo.com/file/loburetodexokazu.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/tebadojarajijike.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/48000149461.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109171650479695.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35640649225.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d8e57632103720922cb132720ef8e245/32610092336.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_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 19756 bytes
SHA-256: c03c9cef899634e471c306e0a716a459ea9367f919164d03f8b01bcac2249608
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 11072 bytes
SHA-256: f8cdf8399831991f8ca13c11a3d6cc8c79068c8d6bec02db361818c20b1dff9e

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