Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a30b339edcf972a…

MALICIOUS

PDF

93.1 KB Created: 2021-08-03 01:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 958e9a5b7439156fe7d3d45958829567 SHA-1: f5feeb0047ba8e5167911aa48841b515692c1c2a SHA-256: 4a30b339edcf972af945a8163e0a613abfc3cf143459fbca23043859383ec57b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and link farms hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=launcher+iphone+mod+apk PDF link annotation
    • https://prcomponents.com/ckfinder/userfiles/files/sapetuwulakobelimivugijat.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/44882560357.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/kuvefeb.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/i86pmnj1cln7tv7dhgeqdmq6i1/nivufaxafi.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1072617683608e7c1d3836b.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/67820773317.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/91135731354.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vevipusakilobebibiwemipoj.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/81457258164.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/dotoligetukedigo.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tipuw.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6102505e8---81979040526.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/tekonigujujinu.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/58974453248.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/384e3a118817d092079e9b97fe1c0585/sakamesu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ab8694edd---222712181.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ab9f17236---47609446097.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac39c4c87---batazix.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/wukoxubamafitip.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/52a3e48e7f2d603b5398965398a5044c/37878555464.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/rugala.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021072612301173499.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/37aab17a5559af0266a86bdc905202a3/jopowotevovurugabu.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/47645155747.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b62de81e584---kawaleburotenaveluvuburu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 18552 bytes
SHA-256: a30a5f9f7d5eea16f2cbd369147c9de32b7f0b73fed9b05593e209906a478efd
font_03_sfnt_off00014baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAF 10616 bytes
SHA-256: ad016295f4351ef8f11ac212185d1065640ee342b98a998f2867bf7136383b83

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