Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f866cd9a041ff08…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 64e3ddd696610078fde0d205c21fb789 SHA-1: d2d9e352f4d7c8be6fe8e9d1e4bb0673ca58c89a SHA-256: 5f866cd9a041ff08b39a3c5499da4f8f2fc329e8b4679bef06b4e936103c2094
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=cares+act+2+college+students PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0adrh8fbeokh7euibcj51rqfh2/nixejiki.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/6284056563.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b6fd7940---72311784893.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/vuzufo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/18f2qvhjp38pbcq2faokad8l27/guruwujadawipinolemi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608664068849a---63766801901.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/7059157604.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405eeb2ad7---49595714150.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/23479905405.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/21711274718.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/99291727391.pdfIn PDF document text
    • https://patc.fr/imagesfile/xidiguk.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zifovixelifukiwonat.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc43ddf731---serajagunudepolusenotebu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xozevegijogelalabufifinot.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/777101a520e6454da4cc3a79449b8cca/48224816523.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/e7b7fd2770da0a0d4442fc26c6888892/4416233811.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/krf57reoegvugovgo0gqe4m6r2/72692270238.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/lugenubenekidutuxerojuda.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3438f62f21---nuwigujelubixopudono.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/65897460535.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/i04go6g3idl4i4h9bbbj8c2fol/7241044402.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_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 17192 bytes
SHA-256: 8ca0ceeaa8d215d43c31dda7409cd2cef6a3e724a7ae3f24827e141bc7ba760a
font_01_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DB 10704 bytes
SHA-256: 296d2d22a6167b5b2aafd45aa157ffbb00500a84e4db4423ad21dd5058d46102

Open this report in the interactive analyzer, or submit your own file for analysis.