Malicious PDF — malware analysis report

Static analysis result for SHA-256 c551094432880ce3…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 10:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16ac15dcaf3f79075a6e82eefd11955a SHA-1: 13054c4200a9c8b8cfe707277d5576478590d579 SHA-256: c551094432880ce365000511c2bedaa7aa23659a075163120d5f906161869685
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to websites that appear to be compromised CMS uploads, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aqojm7n6jqbhpdqug9qbimmbb7/94306907677.pdf In PDF document text
    • https://baohohoanglong.com/userfiles/file/44138697489.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/715332758fe98702fea21f7750b0cb1a/panotufujesawozali.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/31368969452.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5d12fc2c69f9006ed4c8871500c0ab25/72493781980.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7fb9097e920295e8f7629487520f3766/zoxijejelisujubifem.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb4b0a701---tazapebiwesapigad.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/nelilirukur.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3f6c3c405d924eac30fac0bd6af13aae/4424477221.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083454c75c27---25623099725.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/90674086668.pdfIn PDF document text
    • http://techbis.pl/files/file/wozizixalat.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7a1c0e96c15580e6631de24b9a2eae1c/30189359786.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a433105b539---zonizavesuzefisubifokaz.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1aedaff4071fcc9dc9a1978234232db2/favomuwusevijujas.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/lurebosumot.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e78423446---duwopabumaruxalexukuno.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/mipumutovot.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/da04647780433a0c18689d5a3567e8aa/diverirevi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vddhutvo32t10bisk4672ddp0g/nigifanezimodekujamozo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/88u9lqlt8hp9s4hbkk90t1df90/92415719600.pdfIn PDF document text
    • http://co-mit.com/uploads/files/tidajanonutimigumotoxutaj.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/47437418461.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6vo9duvmvagk3ntbb6amv85gsu/5731012332.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/36820a84597c78a8f14ae37288e28b42/vigixerewisolodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=end+of+the+century+watch+online+freePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 18064 bytes
SHA-256: c390be14b1da86cc6629f52282e78c14f23c6dd78285c42dcd0762bbcd5ec2de
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 10688 bytes
SHA-256: ad23bb32dea3d4f15515c670780daa30cfc8122ad6f0ff1271e788dc3c57f99d

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