Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa10a3488289300…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 08:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9fa0e0090a54d33582613ca199a26db1 SHA-1: 562f1d737766f9aacc34b85fcaa10c2a0e3e241e SHA-256: 1fa10a34882893001d3b93683590e0cba14a8412b61ac9ed54526c1bc47a2681
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://juha.be/_files/file/rigupivenixevig.pdf In PDF document text
    • http://studiocariola.com/userfiles/files/43075027293.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16280484997055.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/zuvesajova.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/mivutexikuxidur.pdfIn PDF document text
    • https://bnovum.hu/downloads/jajezilazifugamikuli.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/80687868238.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cb62ab4c5ad5d0e67f9ec504e736f6c0/vofepudenevebizerimoj.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fc825bf2af27093e84f114b00cc935b9/kewajew.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/runejarelefazuse.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/2633620288.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/24d10ed3709218d3797b99254d22354e/35305929123.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/602a9e0028fb5cfc37b2cfaff98a1b91/90717319227.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021828548533186.pdfIn PDF document text
    • http://expresskaliski.info/file/17157262776.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611904c6151af---mipizanujagixusexezogu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc4c0b041---xutikamenuwivutipebifojek.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/19356639473.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/gotugifafe.pdfIn PDF document text
    • http://huimao.com/upload/lamirujidazowogito.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c88355e43---88792486004.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16118f25ec88f2---fuvebegarefubu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609667fde9fcf---vevafuvoxebirate.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/64271900222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hardness+conversion+tablesPDF 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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 17044 bytes
SHA-256: a5df0d8b14709af4bae95dcf9624d818cc75e701b8ee381ea0d83b78543c08fd
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 10560 bytes
SHA-256: 9896b14d9b0d9322d24e60045575c5a01a2f13d7eaafa33dd22f0955c9b84d28
font_02_sfnt_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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