Malicious PDF — malware analysis report

Static analysis result for SHA-256 992d4eeab4b7e493…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 08:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 096a2b6114c82ff0069e45fbb0e008a5 SHA-1: e4277a27d58ed9813215169ec98b16c45c9fbe51 SHA-256: 992d4eeab4b7e49304dd437dcb85d381772a4cbd8b671a301860487571ac385a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised WordPress upload directories suggests a link farm designed to distribute further malicious content or lead users to phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160764f38c2452---nonuzizakulero.pdf In PDF document text
    • http://parzenica-bialka.pl/userfiles/files/dojin.pdfIn PDF document text
    • http://dogable.de/userfiles/file/ratulufaromov.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/47916410262.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cde461a2155a33e1d83c0e718bbd7d96/gofujezofisodugesen.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/fakenimobotitijejamiku.pdfIn PDF document text
    • https://digireg.nz/upload/99515717407.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/da4ecff92c0ade90f17341a0d5ae8d4e/90860204024.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/perisunosobazujopabilene.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wabajaxomenar.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/zelozip.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083be43a6d46---zezetolezagevibemitux.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd805f3e8cf---kagiperumotorax.pdfIn PDF document text
    • http://partnercable.hu/files/56577619562.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8cc0527c---lapubunujilofasi.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/15040963271.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609573847054f---zidat.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/19769883424.pdfIn PDF document text
    • https://activepymes.com/pub/file/nufozusofederokumidubaved.pdfIn PDF document text
    • https://amgaa.org/temp/files/gekijatezuzok.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/40838453386.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/18316502453.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/70529031827.pdfIn PDF document text
    • http://limoride.net/gallery/file/43952393826.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/37710742070.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/tusigapatiwafuvokabaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ford+explorer+2014+owners+manualPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/samakarimirajug.pdfIn PDF document text
    • 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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 15924 bytes
SHA-256: 551dfcfbfab4a35b999cc178a2bec2a88ab4ae9d7ddb501369fbcf54189d937a
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 11000 bytes
SHA-256: b2b45be63885287b91df747beae725d7d0c7f9c32f94f9d7c598a067f53a1e54

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