Malicious PDF — malware analysis report

Static analysis result for SHA-256 2179b5c2234b9dd5…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 07:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9051815b6db4fec8476ed316f86cd104 SHA-1: d0b30b25ff599f5d136d951298d4f41eac1a679c SHA-256: 2179b5c2234b9dd5505f4d92ba9aa77b24403bce6b7c145438c2b410d552a2bb
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute further malicious content or for SEO manipulation. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://orderkai.com/uploads/files/26849176595.pdf In PDF document text
    • http://bensonlandscape.com/editorData/file/bojubonexiwalojivikabug.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d049711d40b---28376887149.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/75773975480.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc08ac5b1e---kedumepolotul.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8990e41a---31828665686.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/71334967915.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/jebuvubikix.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2defaa4507---10245343969.pdfIn PDF document text
    • https://nattasampun.com/upload/files/54800362412.pdfIn PDF document text
    • https://silga.ca/userfiles/file/gosuxagebujimulusepev.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/nonelilubexubepafivoleve.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/funomopide.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ac689e69---95765950823.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/teroninixiperinojoxuved.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/56684635264.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/letixaterinutarapeb.pdfIn PDF document text
    • https://cecprint.com/images/file/76632319581.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7066uhggsd1dm1c1b48rpv4g5q/29388717342.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1292cfddb3d6bdd974f6b403e4403575/42905595076.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/teworujem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+muscular+system+worksheet+overview+of+muscle+tissuesPDF 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_off0000b64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64E 15980 bytes
SHA-256: 930bbcae0d3e7f2f533316ad7f37e663886b1f71d174e3b9575a219ab4d130f4
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 10920 bytes
SHA-256: e1f0fd37bbf06653ccf2a9327fed9d46d341f92ca0fc5476280a3288f2a16dc8

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