Malicious PDF — malware analysis report

Static analysis result for SHA-256 541df5709b0788d3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 03:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ebabecaddc7d83d2b1beb72660c5d39 SHA-1: 13d67574eee0f21cbd3f50ed319a1c6cf76c57f8 SHA-256: 541df5709b0788d38f8cb9548e2a7d31b82a6c4238bc911cf76cb3fc1d4903b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://webminmax.com/userfiles/file/jaduxadafidavomaw.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/vadorigeka.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/92924976168.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/gusigodasagukuwure.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/tamazivegirofalok.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/28578097090.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/wibufozu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/86933321706.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/60105882556.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/33197045997.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9210ebe52---30107070780.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/21921151917.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/re60otacgm15pgcbqhk9irvdq4/regexatutudakul.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lapovigotivobipeji.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b3clh98ub8e1nrpevvl0rbgib7/zizawozopatido.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/2746763393.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/7812451648.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kidetaxesoluzax.pdfIn PDF document text
    • http://usagimatur.com/files/others/dogeranoxoxoj.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/tatinixaveribini.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/23063142599.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407d771a7de---33077803211.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141667cecff4---sikasuxe.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/74354538054.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jalivukafaxamifofike.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/didamorul.pdfIn PDF document text
    • http://showdoimovel.com/files/files/61705914782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=naruto+shippuden+213PDF 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_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 16636 bytes
SHA-256: 74824fb2579ff24b5c8429cdb2474233ca7d76284edf2eecb87d64468a44cdf7
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 10864 bytes
SHA-256: 5a83c6032e6c4210e1a6044a8a7243c51467a1cdfdefd695dd178d0bc40d8899

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