Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a3afe4f3368263…

MALICIOUS

PDF

77.0 KB Created: 2021-08-28 04:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4384140d6c8df135862f299be3ce75d8 SHA-1: 03dec7e392c8636c472184426c25d4c20881e49f SHA-256: 19a3afe4f3368263c8a0b363a93933bc2cefb13250d5a0c43dba48dc0a3fe8ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://computerzone.pk/file/wovelo.pdf In PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/78167714267.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5ca77b68331bd04198c337c073dab4fb/42892930996.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/zamijozedafefude.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/namidiraxupilu.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/bajugege.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/280132549110.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16075022ab7325---67466373775.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/48547244761.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ca99fccc---fidesoga.pdfIn PDF document text
    • http://splogservice.ru/content/file/vasojegiwagavorazafajaral.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/vitorasa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc6a0ba39---17976326056.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/27129414868.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bahnlmujjn88ir34ahs9hjmo82/1971292911.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/44323203382.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b268a6cfca14653432df464298d88280/bibazi.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/lipikewe.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/1138411497.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/fawazuvebanexivufugomefoz.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/70996786313.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/9622714167.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rigixogakuguvasojo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ovhapdsintf28ehdcmvjhth9lg/zenopubaj.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j0tjf83vjm4rpmp8hbjvpiu2dv/potaboxikid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+many+babies+can+a+rabbit+have+in+one+litterPDF 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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 16336 bytes
SHA-256: 48c9ae84c81922fdc4e0fcc603010168cc186b0393bcefc690371a1d6c55769c
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 10892 bytes
SHA-256: 34a430d88f5d49a0de4c4a63249ae9ee65f90bb8538413177efe564e0c374204