Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30c93c78a5158e2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 11:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bb2f4d92c22f083c06b1f11c4f00f72 SHA-1: 0a22df56630822833e5e98ca0c79895469db784b SHA-256: b30c93c78a5158e2c6814d3ab1cca46a99c55b4a0c6061c6daf843652628d187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=convert+html+file+to+pdf+c%23+itextsharp PDF link annotation
    • http://ellenia3.eu/userfiles/files/57563569183.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/49a2f14c9506028a87b86e188b59720a/bufarojaforimafojezox.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18775842342.pdfIn PDF document text
    • http://santabruna.cl/upload/file/salerajos.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4030c0424e9398260adbf1bb1684665f/meretote.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210808_E01030EBDD88380A.pdfIn PDF document text
    • https://mimpidia.com/contents/files/dararorawusikedinebixafe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfb56767b---moxatogakamurapev.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a8c150fa---kebezup.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eafd6bd6---ravevixagetabixerim.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a9fab39f715e4771e411e4d0e66b76b9/96881496598.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/bavepigiwosepunubi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf9330514---71313638460.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/wijokofofatukoxevi.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/lufini.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/svereh4csospvf3boprf07lbr0/98848622062.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/35951609108.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/98005290812.pdfIn PDF document text
    • https://diphong.com/uploads/sazarijujoroveroliv.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/31546117355.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/86467665407.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bikowizatuwetowezaxedabo.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/79866955856.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/nidibefafonaniletadavejo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824adf0de51---getipukifev.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 19184 bytes
SHA-256: 9715844c0afa734a4cce6f40be43f94714d6c977d8fce88ff36d6868562e2a66
font_01_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 10652 bytes
SHA-256: 75dbf7e3bea0673cead8fb778fc778417f849363247b0704e87ddb46fafacf77
font_02_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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