Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f1563cd87fe76b…

MALICIOUS

PDF

90.7 KB Created: 2021-07-23 01:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1ff6bb80dd01814e2c0d4dc5fec17b1 SHA-1: 0913f5a1fc0ba041fb2e49455b4a9d71537636f5 SHA-256: 96f1563cd87fe76b27c525b631a88f3df908c8e99d6db8b85d3e2645ca76061b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kozhikodedeaf.org/admin/my_files/file/wodivujidurejadaz.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609107faa4032---55764510828.pdf
    • http://tele-video.ru/upload/files/senegulevekudodikenukapab.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/78875131113.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/pijuditibolavub.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e99a34c2a---vogezejenizasabevudopa.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/84789028870.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/js724o7bh3hckjn4n13jk7pmo4/63302577510.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/xuperuzufax.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/82ag25f3fkpvjhvrl0p07nqqoo/vabukizurobejime.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3506c478ff---gavefasupolufavedobal.pdf
    • https://dailyiat.com/html_upload/file/53565466476.pdf
    • http://thessalonikiflights.com/files/files/58670646252.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92755a40e4---52388561485.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b630f13d2122aee2d040ba178e018d1f/20921905168.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a501f8c29bb8b01ca8a4c79efd182f50/tomabazarimebemotezeteji.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2158deca---11110623364.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/i6j8bev8fc7mn9vlsjlludrjpl/9977363455.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/248e909693d35496927da4ad773397d2/radodaxowo.pdf
    • http://metrocars.london/survey/userfiles/files/69520688726.pdf
    • http://potlista.com/file/files/24066631519.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44e310dd9---84825868502.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/uq8lf7n2jes7bfhtfutgah0gog/waxunobowarexil.pdf
    • http://tubietelbar.hu/uploadfile/kepalejabi.pdf
    • http://hvpeds.com/upload/contents/file/tejelirulizakijevagemiw.pdf
    • http://ahcxdq.com/uploads/file/23064722985.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=legend+of+fuyao+review
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16792 bytes
font_01_sfnt_off00010ec1.bin
e2d1f0706a57b89cd5f962938da5c759d3327a7fe742ee2d773b644627de5a59
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 10540 bytes
font_02_sfnt_off000126b6.bin
d7fcad9ebe705413f66448cf2cf9b7466de5204483154b8ea7146364f459b931
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 2088 bytes
font_03_sfnt_off00013018.bin
e9e649eb454187e01670290ae042eec4defde92465ef1d84ab68944df2f4123c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 16588 bytes