Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb16a0d93bb2a135…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 12:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46ea8b6967369f75d94399d4e44f6f35 SHA-1: cab0378a261cd60f8e77b65cb9ec8487f22fb933 SHA-256: eb16a0d93bb2a13529a8ddc10f0138d0d7ca33a3155c1b464a8dfc76f945de78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f233564006---tefowenezugaga.pdf In PDF document text
    • http://joltiy.ru/uploads/files/47561300608.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/90350294614.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/nefokafezebozize.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/suxumikojebibexasa.pdfIn PDF document text
    • http://winso.tw/userfiles/file/58161548144.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/bt2u32nmi5q8ge2akcic84eav3/vomujujewalasolotawi.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/tozaz.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rikesizodobovunutinolu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/27973376687.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/puwobexuboruxuz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cbe238b8---52092500615.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vasuse.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/26290444689.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/xilenozipapenagetaxedem.pdfIn PDF document text
    • https://simorgh.it/uploads/file/24880585184.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7839b37acc3d24a65faefe8f985b4f6a/86132557080.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/90094875644.pdfIn PDF document text
    • http://trubaopt.ru/content/file/81988811950.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sajorewororaminedeti.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/48709330498.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/falegoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=eukaryotic+vs+prokaryotic+cells+pdfPDF 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_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 10864 bytes
SHA-256: 93e78dc714c321be81b9c2fe17f472ca83d50e6554b49a1c32ed060de691e1b2
font_01_sfnt_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 14864 bytes
SHA-256: 655e43fc1f447c8b935c7cb38affdf999b3de60374cbbb67cf0594f0a88be677
font_02_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1