Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49b37368d97071a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 14:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4a6c89fbe09e7a86412343d6def06f6 SHA-1: cebabfd561bf1031f8caaea95710c1853186071b SHA-256: e49b37368d97071a854492b4893363b28944bd75fbe281cc95d529cf38c96345
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 disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krisoc.ru/uplcv?utm_term=on+instagram+can+you+see+who+views+your+profile PDF link annotation
    • http://cnwt.mgo.cool/upfile/files/2021/09/16/xomakatesutigefiz.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/22b5190d39b0787daf92c74d081b35ec/15564025552.pdfIn PDF document text
    • http://przybyszewski.org/image/file/2042382985.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302dfc06a5e---49961314500.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ab4cd4eca1c5aa03edb12fd83027e887/sofegiz.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/56502050134.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/wanolamununabixifer.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/62491652032.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/sejupivigotifuvosu.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/68456710270.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/17136285604.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/82031143937.pdfIn PDF document text
    • http://dgkno.cn/upload/sojoxiporut.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/84872084604.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/37224765777.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zuzelebeguliledep.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/45556196319.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/safafimofiboxiretaxoli.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/fakanuz.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/figizeduvilikipudulepudak.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/petikebukagep.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/092151039619.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/pusonugasakoladurenuna.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/pufup.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/kutudijaxanimupilab.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/pegabijawixabuluvorudoxi.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_off0000b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 15484 bytes
SHA-256: 9892b5766cb43986b7d50e14d9944c03c1f7d48f5d4ca41e3ea33a1ac51497e3
font_02_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 11320 bytes
SHA-256: 784b4a9e405a2b47948f073eec491855a71656a93f7701c4860b89e250f5639d