Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c134b91aebe138…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 02:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 634274e0083018cc97f2adbfcc5c1611 SHA-1: 93d03edba4b2106711715ee85eb2532047865d83 SHA-256: d9c134b91aebe138deeb8ad9b7c143fa138dbc236707ad57a2c083d15104d714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external links points towards a potential drive-by download or phishing attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=pond+construction+for+fish+farming+pdf PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c822d017167e019f8752888b83384b3c/mapenuz.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/dirudekibebo.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/54032020576.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96c36e15be732d71b1395d49bb744b1f/58074584705.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/pufegazebovej.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/26170297630.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea0621ea8---9653170406.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec5d6bdb5---89195028951.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacb4ea363e---91381411643.pdfIn PDF document text
    • http://telecycling.org/files/file/37447137410.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607968037982f---43249651983.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805650ad825---gigofomaza.pdfIn PDF document text
    • https://defi128.com/userfiles/files/porivi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/domekavoseviwelivobir.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e57b9d6572c63c6e1351d87f281ed673/49346232796.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/74745467150.pdfIn PDF document text
    • http://sparkpro.lv/content/file/2845700764.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/vopijogidisokomiw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3sjcr33rg5abkmnppj499rv523/lebaxadovazob.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/rusalodo.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/fizeti.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/sadebulowawezurosojoti.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16092efcf80317---81939407474.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/11500314982.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/35235484480.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/bilokesazanifuv.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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16268 bytes
SHA-256: b227e0ae41d48269ee694ea7d4bd9833ff0799fe6c662bd44939433a333e3780
font_02_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 10992 bytes
SHA-256: d1b11a53c75b5775246f7d28c7072aa0f7804039eda15e3fc97b000915d3e26d

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