Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfed08c5e40a6bd7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 23:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77da88cb2ecf85750f1921559b8b67d5 SHA-1: d8839de3b2bbc30b5e55a599bd950ff4cabe9f17 SHA-256: bfed08c5e40a6bd7f4131ac005995495ae0d50ba7772541a03699d95cada74aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs, some hosted on compromised CMS platforms. The primary goal appears to be directing users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://eatorhours.org/e-bussiness/fckimages/file/palijevu.pdf In PDF document text
    • http://sotel-perm.ru/site/file/gizomoseboladakuzenigabed.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210619041849.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/61504784129.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7eac282f---88047632718.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/vigejojalune.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/37648433527.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/sijewisexagamapax.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/466a378d8a18a1ad62937ecdcdfcf250/552224619.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/50257106036.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/e1fmn0stbun7gqeufkqgoab1hi/geperikenavomolomupur.pdfIn PDF document text
    • https://kede.org/userfiles/file/mavitadevogewuxavabano.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/14238544221.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_5A5613DCE2260F29.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/birivazagivukexina.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/jukirubogepiso.pdfIn PDF document text
    • http://millecolori.it/images/file/vudenekuxovogilefudela.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/42294921194.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/61708485366.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/k52hfpvki48qft7aummmr43kl6/24430181569.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4f0b7fa72e242fc725416f8c08572a8c/sixepilezulalugupixuvag.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e0186eb75edbced83085120c84c9066/wuzefasofeli.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bf62ed0d7c2---vasepoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=allied+health+professional+development+fund+%28ahpdf%29PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37E 22488 bytes
SHA-256: 2d280f5a9f00d0d7af8f9067b3e3cbd253a0dada693bd154ae7e7f2434b420ec
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 11064 bytes
SHA-256: 46d1dad28e510375098721ed58a1f3f6d6abc6fd7dec932429a96a9cc0d97bc1

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