Malicious PDF — malware analysis report

Static analysis result for SHA-256 913fd7e25ca1ae9d…

MALICIOUS

PDF

75.3 KB Created: 2021-07-02 11:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 23786440dcd258fe3a3922c4c9030936 SHA-1: ed4876836b8ef71238df7f3bb3b038ff220d52dc SHA-256: 913fd7e25ca1ae9d23d98aff121696bbcfa16f5c4d740e494715ab053b901f81
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=mac+and+cheese+near+me PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/olm9sthvqf83t6epofk2klqj53/90911270823.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075a702d6879---kiwomanike.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/zatapesovarutig.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b2636447b7f---84140032353.pdfIn PDF document text
    • http://ipllaser.in/uploads/zivavoziwe.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e7f5f6a3---dixuwozuf.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/9350790071.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/90150020126.pdfIn PDF document text
    • http://funperm.ru/content/file/72746068490.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607119a73b018---zaworopowevur.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/rejugudupolawawuwolakiwo.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/jirexelotixivero.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a566ee296a5---34871743806.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/73954984215.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e2085d1bdb63436391d6251eb35e8f18/fijuzajaxokuwuvolefef.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9a46307f5---3858912071.pdfIn PDF document text
    • https://kristinanamaste.eu/files/61444330173.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078098de97c6---nomafupagomefanigetodipu.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/wapubozezafi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6c191297e0514d460a6779950ed0723e/62057762295.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9353f8d44288db31efd7ad1fa2c62606/kaxidowogomize.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/zugupanimapuvofisos.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27811588d---23780992502.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dc69f1d02421444b17c6b1512bb14315/12556243781.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6e3624894---94193125694.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 16728 bytes
SHA-256: 2f80ec4a93b2b8a98c75b6cd52e97827cb04a1d3a2f5c5049192734861f0f3bf
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10272 bytes
SHA-256: 323efc3b14e5cc525266ad48264343393ab3b0ca9b702c74145a76dbdf8aa349
font_02_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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