Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7531607fc0c93ef…

MALICIOUS

PDF

78.0 KB Created: 2021-08-20 00:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c288cac3de34397cb8c688acd6c58861 SHA-1: 66181e1c0258ffdff10c38e953808055d23505f7 SHA-256: a7531607fc0c93ef3486cf89e9ac8b6b740c298d9dd2f44c4096f9b672e588b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a phishing or spamming attempt, likely to harvest credentials or distribute further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=stanley+garage+door+opener+remote+programming PDF link annotation
    • http://igabana.com/upfolder/e/files/20210708135529.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c92f03a5ffd8e5b452c9a896335a38c5/93410475963.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/dunevogigavezazevosokipu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd976676397---zajenufapakoju.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2oqvf87tb4qf2cboq7tocdst74/925155970.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/340fd467b950bcb1146eb937f945f5cc/vedakabegenefizazasudadi.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/tozusinadar.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/jemonajo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/46215073104870709473bf6a1bb1a82e/zigufelupizox.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/dimobodegebajiberitojij.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/88597196042.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/11787915896.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/lefazaposawalerenozajesa.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/banuxe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/17302147861.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/12786962215.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c926693ecb---46111111831.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bl8ejji290acu7pm06qthr00pr/sezamotepegediwilepowo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b4b5c4c9---21364740039.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8u0gplsi655u0pjqtv8jsa54a2/gonavokelivipipa.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/73af0e4edcbe5bd53491b83ba5fcb4ab/janusagip.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/vogatu.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/41004335140.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_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 16056 bytes
SHA-256: d5d478602a3c43ba713c48bd528f0358767f658bd82fa0601af6ad878081f9a2
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 10756 bytes
SHA-256: ba80f20ea2a8f68dac65fcf8db36cf51b0cd37c87cc945a93c94f5e1b6ceb16b

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