Malicious PDF — malware analysis report

Static analysis result for SHA-256 674a38e2580cee63…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 09:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 286a53b577029b583de6f784d6d27691 SHA-1: 7a40e596fbdbbe9629b8640c39c75dbd801c3b2e SHA-256: 674a38e2580cee63545f392940d48b0c486cb11a011ebc2fb24785d9229d0340
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 functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=me+before+you+full+movie+online+123 PDF link annotation
    • https://igk-lilienthal.de/downloads/goxuvotevikuviwijuw.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/94167565072.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210909_065445.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d41p6nrrmvv2d3rgfvpgkrs0d6/fiderajuwopaxolobef.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/35895309437.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec3a46413---wanakinedatuxefomonazim.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/migotusav.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/56212847537.pdfIn PDF document text
    • http://reichspfarrer.sk/file/17494325694.pdfIn PDF document text
    • https://digireg.dk/upload/97936152210.pdfIn PDF document text
    • http://ndt-ultratech.com/files/geluzuwa.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/79877403691.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/753037821.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/mufizanuvesede.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/20653098309.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/66785460704.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/batag.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/10086548198.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/fuxeritufedewupodemozew.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/46347362331.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/75494958273.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/68839279265.pdfIn PDF document text
    • http://gojjang.com/uploads/files/lamefibinusop.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/kewizajimavuvuzumenozu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f9031320c967bb62c8fee2e203bb6441/45973779963.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/21036995104.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_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 10704 bytes
SHA-256: 67b372977e00241119c2279f877f63283436f37ae067b7b7548861baedf8f29a
font_01_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 17300 bytes
SHA-256: f705b20131def77c48776e5d37423941bd79752ef9157482554fee9f225eb876