Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00e06451ef35ea2…

MALICIOUS

PDF

82.0 KB Created: 2021-10-06 17:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 93cb8f780ab45792caa11c8c423eacb3 SHA-1: ea4ecf3d047da3f25e1ee2e9d0875292ad5d2909 SHA-256: a00e06451ef35ea29b51eb78b637f32f94de9939ddafa149bd571babc8450872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on potentially compromised CMS upload directories or disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.contectrade.hu/fckfiles/file/92395042310.pdf In PDF document text
    • http://chinalabware.es/d/files/68223209289.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210909111256.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/85367662298.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/rupixijimegatotituvumogol.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1larl033julc58hbk5ka6erigp/69784882306.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/xeputijutelexenapizopadaj.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/41918466108.pdfIn PDF document text
    • http://safarang.com/basefile/files/51924855678.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/zewojedupidudegep.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/88510397017.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/265e61e5f5d6e0d0c690852a98586bcc/6461230952.pdfIn PDF document text
    • http://rideco.hu/upload/file/jaxolad.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/fokudaxabafemuzavu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/45806888478.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zalutokalo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tubuvipazamexufetunu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6de873265---zanumezodukinosokoxilutib.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/73437150727.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/polujobavu.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/82156427140.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363f42e3f16---kuwipalisosulelazotobu.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/liref.pdfIn PDF document text
    • http://hidropro.hu/upload/96408642918.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/zomimoxeragax.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1b1d8dd3592b64f7231a8418ef34a6a5/72435793319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=trigonometric+functions+of+any+angle+worksheet+answersPDF 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_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 18804 bytes
SHA-256: 044be20e0d060604ba236c708a4ab9665983518b08a74481571fa44baac1eb2c
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 11136 bytes
SHA-256: 695d54b92eab7ef0d92053a4e969e0b850b61834ed2ccdf5195d5f3aae8268de

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