Malicious PDF — malware analysis report

Static analysis result for SHA-256 734cf53c0d533403…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 15:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82cc21124f5049234f10d7027fec302e SHA-1: 53f445cc9c33e522be1a0085012956037f3a953b SHA-256: 734cf53c0d533403839cdf4f55f6591d2456cce3087cd7bfcaaa62354b0d71f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic firings suggest this document is designed to redirect users to malicious content, potentially exploiting the user's interest in job descriptions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.reenactmentmarket.eu/images/wyswig_images/file/tiwalodutemafopomosop.pdf In PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/55607235156.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b9041e01---towakox.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b847163565e3f0550dfc9ae72893258b/fuxeworukinan.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/tuxugabujovikizububenip.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ujqtbqcafnonf8g8gon5degmkj/37116360681.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/76132661141.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5307ce7e---19326214768.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/nifudibude.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/buleniwijulinuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dsjjduohovqbvaq68506p29k46/wofipivadumevis.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/88108118458.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf93d4bc45---mavuwogikiratunulexe.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa0941f7d---joximufaligataxoja.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/fgdv3ur3375nvm69ts68ulab44/42329307051.pdfIn PDF document text
    • https://cecprint.com/images/file/perilenerinaxisogok.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/zesusivagiluvi.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/bonesuxo.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/25224356640.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e79c31154---bimuwagedupuzizuz.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/82c5d651aa6efd94298faa3edd3163a3/96514427043.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/susuvazuxadojijazureko.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jusajudukixaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=business+development+head+job+description+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_off0000d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 16908 bytes
SHA-256: 0f77d7e56a93bedc8d9b786e7c7c6d61ce761eb48b195fce0bee2f08fe4e2076
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 11376 bytes
SHA-256: 72fcd2fb0285b64e8d103537c753649710bd18116e72771d8be22a7d285aed25

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