Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e981d605ce49a3a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 16:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8d292d0bc3e1dbcdac95827bb9d5af9 SHA-1: 6e312602adff6f447bf9229787ed699a22a8579e SHA-256: 7e981d605ce49a3ac144db1dc86279d69c1ecd1df7e5ac73fde22926f6401e7e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs are hosted on compromised CMS platforms, indicating a potential distribution or redirection mechanism for malicious content. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://yorktownhs1987.com/clients/57482/File/18611313697.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/54756843908.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/musasinelurup.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/rixusixapigimudakomez.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/susapojiduzerubono.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/45349445165.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zetix.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/68385755636.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/99141687175.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/peksj6dqhfjgv1njdkefvoicho/goxapob.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f2d3a3ju6r8p51ai7db8l4ufoo/50615503773.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8b7b1ed7c4098046719aafcff6e56611/41494651977.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e1b67c11---sepewodovo.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/82867076571.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/52415025957.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/rapazukinopanetabiw.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bea691777---jizofikokurinufi.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/zirinefakewig.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/11400646719.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/zojasonapajawobiri.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/faxakawes.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/52923316348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+multiplication+worksheets+for+3rd+gradersPDF 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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 18500 bytes
SHA-256: 20e86308b2f454f64db9dc03114021a33292b9598b41baba014d5ffc8e6fb129
font_01_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 11492 bytes
SHA-256: 08c21760d5cb9325c087ac5bc344c55be1c4686a32ca685ebfc5df2f1910a644
font_02_sfnt_off00013781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1