Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa2c96cbc7a57b5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 20:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b15250412f489361bff4c1a965e2e9c SHA-1: 03933d52c6e59e713ef20bbd715564e730325ada SHA-256: daa2c96cbc7a57b5791dfaa9c6a21328f78c614023115914dd3f0d1e671ce448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://grafichesirio.com/userfiles/files/karaxudomoludijuzo.pdf In PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/94890011673.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/69011281997.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/wuzosusetilubasogu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109080155394425.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7b3j5trsro33mk83hahdbcinug/29463066225.pdfIn PDF document text
    • https://taperagi.com/contents/files/48357345891.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ee2815d---zigetebokijimubusiluvivo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/vapokadegubadifikuti.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/17061586706.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/49545125373.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/puvezetakegusununewufo.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/27548655915.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k95i4u0hvabopm64t0hqqlgrj0/paxeru.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vusejisujewodixuginapu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901120643993496.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fuvazib.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/gaxejebukudasomakora.pdfIn PDF document text
    • http://live-net.it/file/87931744074.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wijupete.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xalabaperexuxumegodotupid.pdfIn PDF document text
    • http://eva.am/files/a489deba9f9d9e54.pdfIn PDF document text
    • https://svltv.in/userfiles/files/38895645787.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/8733549457.pdfIn PDF document text
    • https://stvorki.ru/files/file/32022140795.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/47427036545.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/16363096402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+android+as+controller+for+pcPDF 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_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 17628 bytes
SHA-256: ff7aee952c7b7c5e246be54ec937cdffb1bf7a279d055e3f3b827061cabbbb33
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 10792 bytes
SHA-256: 7c8b98b67432d9844c61bb55eb0035a4bcf323c750fee42c0d836ea1ec5e665d
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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