Malicious PDF — malware analysis report

Static analysis result for SHA-256 544481482caddb43…

MALICIOUS

PDF

96.4 KB Created: 2021-09-17 16:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edd2758cc5a611947f25d6319290fab0 SHA-1: acb3cd5adde91e77b3ab5b1ab2e0005df2e5f193 SHA-256: 544481482caddb43a018446905a1d34031f48aa9595ffa6f22cccb55953d6dc9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nandishoverseas.com/UserFiles/File/47237728489.pdf In PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/39668189277.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/ginosodikizex.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/21018325558.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/luritaluzukatobepexigewom.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/11530754948.pdfIn PDF document text
    • http://ty-int.com/files/files/78479312919.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/73272540722.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/6999691156.pdfIn PDF document text
    • https://datajournonepal.org/files/vemepipizejuwofasij.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/3169682528.pdfIn PDF document text
    • http://www.og2c.com/images/file/81164370200.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/96007487471.pdfIn PDF document text
    • http://cloverdiamond.com/file/tiwunotozitunuguzozuzekuf.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/zetemuluzubarujuv.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/6448798761.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/39242724469.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/92263391697.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vmsrmih7etoodl80vqs1vls4c0/88414799288.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f40e7287b801553cf617b98002741ef9/patovaxizujirotawiwaxifum.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c74ba29c---70449956351.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labejinerinamakul.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/33138584516.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/ladizarotojav.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/rokesupoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+hack+redmi+phone+passwordPDF 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_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 17504 bytes
SHA-256: ef3092d343dd7c8f56c3ea559c7c7f73868a501911b1af8656349d21590cef26
font_01_sfnt_off000142df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DF 10904 bytes
SHA-256: bbc28adef936920fb830a509129e663ffbe7b8a036ceaf9c9ca409cc22108b80
font_02_sfnt_off00015bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1