Malicious PDF — malware analysis report

Static analysis result for SHA-256 10229b511421a259…

MALICIOUS

PDF

76.6 KB Created: 2021-08-17 09:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2b780e8d86af514d08e0cdbf185ef96f SHA-1: 800f8058d579ca0b6878fedad68fc56eff5f749b SHA-256: 10229b511421a259b0c2aa11afbfd3bcae4e013c16202bdd7e55ae0c7ae06e10
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating random and compromised URLs. The presence of numerous links to potentially malicious or compromised websites suggests a phishing attempt or a scheme to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hanleyresources.com/images/lerov.pdf In PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/dinalinoral.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47056390923.pdfIn PDF document text
    • http://scantech3d.com/files/25807247159.pdfIn PDF document text
    • http://glastergroup.ru/userfiles/file/notefidefupigenurezij.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210628065327_elvzn7.pdfIn PDF document text
    • http://fruitvita.com/files/files/68490105198.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/27495892669.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f95bfa79---73038966296.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/68469441134.pdfIn PDF document text
    • http://multiairservices.com/multi_air/upload/userfile/files/bexovaruginesenosovuba.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/30924041652.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/dakevuretu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ee039bdc159220a86f6f5845010fada5/xesaselatonatasupuba.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1a72bbef0376dcc2d3df24a8d5836786/6265305040.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/45579253489.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/15de8eac914954887a52141a7f453ac0/senabavikurabuzafurufidux.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/muwaxeremub.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/fidovifemel.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o003ph62sbfef3kanc8ghe66j4/35374383528.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/menapejuf.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/56455406034.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/xofuvomerosivikuj.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/nizilogapix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=libro+mi+%C3%A1lbum+preescolar+segundo+grado+2019PDF 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_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 11596 bytes
SHA-256: bed282d29bbf9e3f8dc218daf2279f32ff5ceee1da73b76e6d30978f7ec4eb40
font_01_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 15900 bytes
SHA-256: 7c5d6915a698d6e50b72e578790fe4258e8c1b47af9867f24f48e461499ce426
font_02_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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