Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73eee8a4665b70a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3df0e8cdb0fdbab93f667400ea0a4067 SHA-1: 1d1951b00e14b64fbb2c216178273ab39f95a1b0 SHA-256: f73eee8a4665b70ab8453b97df5daf01e3e4fe4f201922e4cb8a6c9122df0efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://infrive.ru/uplcv?utm_term=free+hero+ml+apk+2021 PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3dc2a95b---tuzibinosavorevada.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/64467325837.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/96763774205.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/zowitanafiso.pdfIn PDF document text
    • http://sunway.me/uploads/file/152044556724.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/narotawosuzesavofinelipob.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/xupirixa.pdfIn PDF document text
    • https://tepihtrava.rs/files/nojezinori.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/28172826452.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/ludepagegelowokadutiloxul.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/70903509441.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/melinir.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/22463557584.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/sazixisipojesozed.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145f9f0c2863---didakomivibukevopad.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/siminudenemoj.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/38162143050.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/21730512533.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614af3375ab2b---zutufoguralunerudaner.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210922005227.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/2287951919.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/xetofesoned.pdfIn PDF document text
    • http://benly-carson.com/product/files/dusak.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/6492493833.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/xaturavob.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/85838654576.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_off0000b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 10416 bytes
SHA-256: 10edab16ac580e2b95d26afd31465e40c0eeb7054762e25909aea6cd33df3692
font_01_sfnt_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 14876 bytes
SHA-256: 5d37f31b99897f557b201d7ef5e5ee4f20cc480ecef57227c1bcb8d409c7b769

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