Malicious PDF — malware analysis report

Static analysis result for SHA-256 221e57498133b302…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 02:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44372cd977d87aa562fb7948f21fdaa6 SHA-1: 63829e3996fd0188b9b0af80c7e195f3b3d38cec SHA-256: 221e57498133b302fcb28038e88316e020851763b4d8ba9b516d8294c9082e67
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. The document functions as a link farm, containing numerous embedded URLs that redirect to potentially compromised or malicious websites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ambalatender.com/upload/files/60270400713.pdf In PDF document text
    • http://rungrawin-itt.com/userfiles/files/60176238071.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/lejufedozotoxagut.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/sagifaladajulawazakok.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/53089218530.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea85cfb20---kosobe.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909132105.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/56567905900.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/tudewedupezuwiraxuzadeken.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/wegabelobarimuse.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5fa845b0905e3bad21dcfec59b343be2/84563929053.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/waparu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0728dcc5fbb82fd586b2f044cd23ecb4/xexipezesinilivufata.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/kukodewinuvixumeferexoba.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109041906525785.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/68307884195.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/21508946022.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/wavuwujigiwidovebabi.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/43624473073.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://alatasfilms.gr/ILC/img/file/20126412269.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/96736989990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=zombie+farm+2+apkPDF 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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 19860 bytes
SHA-256: 4f376b9305f9bf7dd43541bfdef6f3a41344b783f21ab0589e04df04709155be
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 10420 bytes
SHA-256: 69e46ab39abd2711f5e6c3eca77442dca6c740c3c246c801e6187e96bc5780c3