Malicious PDF — malware analysis report

Static analysis result for SHA-256 116675f03afee4ce…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 22:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ec1125961b7028483cd62d60b34a80a SHA-1: cc2e93a046204027bcc34962af72e602ea3453dd SHA-256: 116675f03afee4cedf0dee524e0029dd8aa3c211fee6384116ccc94d82f46b93
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=outdoor+activities+worksheets+for+kindergarten PDF link annotation
    • http://logisticsnetworks.net/ckfinder/userfiles/files/41084394034.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210529_033346.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zinilisedipuruberakedapar.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/katurajexezukede.pdfIn PDF document text
    • https://norservis.com/files/files/45540096981.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd770748d0d---tapagudibezunob.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/zugaraletobaxulaxos.pdfIn PDF document text
    • http://distributoram.com/files/file/gifena.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/kunuzajulanora.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ba22eb0f---98355979459.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/13108493766.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b84b1f791d8---mimegawizaxovaz.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/pagagaxul.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5dceed8ec4aa3de7de15f7d90e94cbe0/vijami.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/vaxajubepu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160821e99a9b53---10296313170.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/67648532485.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/rovigamajibebosudujogov.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads//files/202108082344111917.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/36159794481.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/nuboxesosamoniju.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tapalerosezarib.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o0kolt5damgtjhja9988t13aa2/nelibozisoduvo.pdfIn PDF document text
    • http://mebco.ru/images/file/13268280137.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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 11080 bytes
SHA-256: 7aea11b8678c7a3443ee83293ed10bc2690f6f2527fb54d536d48ab3aed46638
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 18772 bytes
SHA-256: daf2c56d4544ee9dcbdc4e2cf9ea96be2a07ad877e781c5f2b1b4913ea3747e2
font_02_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1