Malicious PDF — malware analysis report

Static analysis result for SHA-256 69601bbd1921f023…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 13:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba9bbf709667544c548a0de1ac631805 SHA-1: aa6d4044c1e3cf4270703c067deb5a6295424e5d SHA-256: 69601bbd1921f0233020ba2f75806b641110a425ea06c25d80c67f778ca1a246
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agrilaui.com/userfiles/file/14963577773.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/0p1is344qfqbt83173e9thkv8v/jokifinexa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a448870bc62---pulunofajuzibopeselolodas.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/10786848939.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d774985f47---mulurovako.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/67115599769.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zeseraxepamenejomevo.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/xarikurupapapiburexeletex.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/69319368087.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/kufetutepapedituzonuvuf.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/xifodipulegunepanim.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/9bof4ld55s7da3llqbpi2oorj4/givudabedagabaju.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/39597516158.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g47lucpmhl28fmib4ec182pfh0/sebubukofilovowotukofufuj.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/vejux.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/47564960194.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/58263205421.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/49221008667.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d3e257f47c1d746cebe153ce39e629a5/31946114345.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/eef20fcd3c5e99d0628c58d63943204c/72098117482.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fefeb16a98a0c71f6c2dfef89789c91a/61444663374.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608624561ce5a---35973011869.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/v0v53an86b1cqja2ji9i35oap9/dubinijixa.pdfIn PDF document text
    • https://tessuno.com/upload/files/6108e69f1d1ac.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=aspose+convert+excel+to+pdf+javaPDF 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_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 10800 bytes
SHA-256: 7cb5db33e668cb718bba367696676d0c376f3403df54729b71ceccceec9a54e9
font_01_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 18956 bytes
SHA-256: e282b81d46243a019b6d99a2c5e4f1b37cb01ac777a4ba5115b16cf171bee8f5
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1