Malicious PDF — malware analysis report

Static analysis result for SHA-256 67438b25158b947d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 18:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58dbfa48f26cb0ff51dbbbbf935a1a0f SHA-1: 663a0170347db9e003ed3aeb63bbe91189ad3024 SHA-256: 67438b25158b947d9a537fd507d3584261fa68f216a136a01c86ceb8a363a65d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests the document is designed to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aldwalia.com/userfiles/files/8229062424.pdf In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c96366d62a3---17925895532.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160803ec47214f---41108427984.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/97974450208.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b501242322c5d48425bb8d302ba7e388/xikikun.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/68539176534.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-24/20210724073105728263.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vigajazotajokizut.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gjjslbd005048h2frinsq8qi04/66026115088.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/76735220331.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/fagin.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13221384700.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822be7ad5af---gilanubarowejas.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wowitoxizamakujej.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/88296110472.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/komugoganamarujulaxipaju.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/ruwajizimenewena.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160716c038593a---simakirifor.pdfIn PDF document text
    • http://mousike.it/img_ins/files/dixaruk.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b239dd425810956f6a6a6a646f7040ff/31584857681.pdfIn PDF document text
    • http://axwelindia.com/uploads/wilikivak.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/kosejapiz.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/xijogogimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=scarificator+gazon+manual+gardenaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 18180 bytes
SHA-256: 364f146239af3d152750a45ecd6e3953afa99e302de4a0645d7b0dcf2183f9af
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 10888 bytes
SHA-256: 5f73cd97f364c672169e321e6b88ca9beacfe01cb0064de3c221a9e548645f72