Malicious PDF — malware analysis report

Static analysis result for SHA-256 22aef5233469e7a1…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 08:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f591e8bac5daa877a34af49fe06f9d1 SHA-1: 49cca3a8fa9d77f18865accfc8fca514d9b3fb1f SHA-256: 22aef5233469e7a1ddde01237f193eac225f8b1f836f213fddd26b2ab8cc58af
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised and disposable hosting, suggesting a phishing or redirection scheme. The embedded URLs, while numerous, do not appear to be directly executable but serve as the primary mechanism for directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://meandnetworking.com/ckfinder/userfiles/files/3906041098.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f4a800552---kigiloxevasaxofusupuwemug.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vadujejaw.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/zilimujoke.pdfIn PDF document text
    • https://ebooksweb.net/files/file/neluzufigotazizuladepob.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qmkg577592j7d9b79ub9nb9331/46217624051.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/db9b460af3fc4cb71e17d79c1702ff63/13102012904.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/87787113081.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/55159660821.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5f60f95b94dd0fa0fefbe908fc65c1d7/nevunafuji.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/91c81cc459f3e6fc9462452c2f3375e3/38234389204.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/892d67d75596982a69320e67ab545ebc/falifukumozagotinedejaso.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161256f0c9cb00---binagetigeb.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945c0b116f3---vuladedolitozavevugodoko.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898c93f1292---bofixod.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/97399458112.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/56883393906.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/282115e4d4ae7a354766b0625d196bd8/kajironugog.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/cb19rrdavd7mfbo4c6vin23io1/fovanubaxufoj.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7bf4c3c3e2f7c29cbf9b789761546036/fumesunagibixirilej.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/zosoxixemopumopazuposaz.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g0rt8qlrt0emo4blp3h75o5k70/logumiwalojazoxagewa.pdfIn PDF document text
    • http://synphabase.ch/upload/file/nonidevewawasadelabexus.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/fopobe.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107141353543623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=you+suck+at+cooking+book+pdfPDF 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_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 10832 bytes
SHA-256: d20b7686201bb0a298719399b585afdd576cd35886fa1c2b4f91e6d2c4f9c7ed
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 17508 bytes
SHA-256: fbf4759dc52f996bddd388300c06d0ba6d8744c9f8210fd6d81721e290ac60e8
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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