Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a1cbe2d21bad98…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 20:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44124fef80cf988b3e8ea9f117d0eb45 SHA-1: ad7e02037a15aedc0e4c8f4db557c1d8cf076515 SHA-256: 75a1cbe2d21bad98ed896822c154de717bdc5e6c356bb54759cb7c1326f77445
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content or visiting phishing pages. No scripts were extracted, and the document body was unreadable, but the presence of multiple compromised CMS upload links strongly indicates a malicious intent to distribute or host malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088eaf03aadc---6619632643.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1otd67dr3b8977rmtf15mch1a6/31866278618.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hm0fc7t9g4schqaionos45qbt7/93184396740.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/60605736110.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/46136966146.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160728921a0c4b---92150933158.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/97f4c8f2630a5a91229141cd72711ca1/tuduxusowupepefuwa.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gfi7t764t3coe0edgaucln0747/gulefijanumef.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/xirigixiwipeno.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/dakefosavaligibidonifiwab.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/83227578868.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2a127385---buluvinetu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/u3e8bogttdt7fqsipj50q7fedp/51884298116.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/33408333257.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fhl960ad6d4pmihbcf4b4modvf/20222366007.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4nvo07guk1l41l2rg5vgo7t2tp/37585939489.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf0b47a14---paxejobijakuf.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5gvgfaj8vhtesikqtaiev2euo0/lujewe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b7baad09---6042577210.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ab5a7a3308bc5de5143c0d0698c3be0d/66246841769.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a2f1f007bf444f96fcb842398077c2f/84819433721.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vm2ies5gck29ni3ptbub76cb5k/likiwusofolajo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2aeb3fce---65366560123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=100+usd+to+colonesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 15512 bytes
SHA-256: a827923247e91c7eeae950ff5bc98a86804f265aeb9ae1f6c47e81a0102d9a85
font_01_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 10184 bytes
SHA-256: 26852c860628032f2ae5b488c7a0ba92e1a31ebe6e823781cfcdfddb688420d4
font_03_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 16224 bytes
SHA-256: 5dc452f2b4f8f6cf50bab96a09d9f243b03113461a4839846761b06a93380fa3

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