Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a549700b9d2c505…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 17:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 954a41f5ae228be1e48187cb3265c546 SHA-1: a9fd56b499884eebfc65d5b70228c93a43c94cd0 SHA-256: 8a549700b9d2c505146c219f0e0f0e320c4897fe57bdc20eaf9ceb802c3df7b1
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV detection and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on potentially compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were extracted, the overall structure suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dichvutot99.com/webroot/img/files/38289118266.pdf In PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/20982276357.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2fca95e7---15235097363.pdfIn PDF document text
    • https://proxus.nl/file/94018696708.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/refuvemurur.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/95075454486.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f570dbe7b9724810b0de0fdee6ec148d/55626641915.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/ponapukoli.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/30709986383.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/zirasaxebuvi.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/lelaremizepativuwegu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f9b3aaa1b98e838a1ecae00c1d2dcab0/govuzapepojomegokapu.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/23913631033.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/pexotazu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/bifojafedonogip.pdfIn PDF document text
    • https://svltv.in/userfiles/files/sedudezisujelit.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/11190190391.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/42274947785.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/87154674298.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ddb1b251---6524630419.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45979322717.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://mimpiindah168.com/contents/files/39990584584.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8cd192fb4c0424e22f5741b63a56ad58/xujur.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/49710331092.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/24959676305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hatsune+miku+project+diva+androidPDF 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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 21908 bytes
SHA-256: 160285b87de760670076afca31a2b5a0533cd15981bab65f63d7b81ea88c2153
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 11008 bytes
SHA-256: d82eb6923e2bc6704de599d364e9778a1c3383de7d9694f2e63a203f25175f73

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