Malicious PDF — malware analysis report

Static analysis result for SHA-256 6593e9cedc12cf4d…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 19:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 66ddd18060631c2d5933ba2274dce6b0 SHA-1: 45381b9ac54e5b9a1e43b1424f88d7a0b9286372 SHA-256: 6593e9cedc12cf4df51f5ae577761bb21672bc29c0e8ff0af05c791f2145bb28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised CMS upload directories and disposable hosting. The presence of 'utm_term_redirector=True' suggests these links are designed to lure users, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=movies+based+on+classic+literature PDF link annotation
    • https://laurallo.com/ckfinder/userfiles/files/revugolifuvuxun.pdfIn PDF document text
    • http://gtshotel.it/images/file/36279102029.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc369a2fb3e---4811408596.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3b100f55353ed86ddc43d26d1a1d568d/tutitidukajeronade.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/af673e85fa5f3f1bee45118efb044c9f/fibotozesiwixat.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb41e03f98---44965324289.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d128bad0c---vigox.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/doruzekagirol.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed1ba174b---43175568073.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/14ad4904df07e65b20e7aac85c418caa/tonemomifunopefebir.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6b7b190581dc112d97bddbe5be8424aa/16617483430.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/73f8ab4cf00c0219f655dba2ceb24796/viwatomidukosijifajoniw.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079340706df1---90493504969.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b761bf82660---12240228181.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/67f3a35c50801c74ddaf152e6fb752e6/18999609204.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/wusagiv.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/69675867751.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/75467167290.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_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10660 bytes
SHA-256: fba99c837a3d102cd1daf9fe86ca0da4542c355fe5cc9b8074642f86dc63f404
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 17272 bytes
SHA-256: 4c698a018ad83e2fabed2092ae4ce2a101a09cac920fa01dff5e165f9d78cd11

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