Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa50d73ef89dfa2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 05:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11a1a554f58e2b5562d77be9be5b634f SHA-1: f85af3eadd134c91f798db306bf01204f7b7bf05 SHA-256: daa50d73ef89dfa200fae1dc93ff8e8757a961b505c589202ecd1417d472cef9
196 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The file likely serves as a lure to direct users to malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=fish+farming+book+in+urdu+pdf PDF link annotation
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/71279680467.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/drc66i9h0nhdg5d8smdp6mrk11/butevabukovojunev.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zegijemajofeb.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/bezipimitemakopofofudipes.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/43643580597.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/witedebunuwesu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f5339e64---ziremubizivenu.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/41427868307.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607409c79a51e---xilimumopivelopituzuwuk.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wifidenaxilub.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c382b9a3526---80594514304.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/44651898015.pdfIn PDF document text
    • https://signika.pl/Upload/file/jipavabodevomedelojo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/dbefc7a026f7afc45455bbf25a3a2df6/tazukukajaxiwade.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c7b994c2---32545617559.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/33583938428.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210825_C547C548D613BF32.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/zodomitisuj.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/bolanavewirimol.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/devomekiratav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 19236 bytes
SHA-256: 25141db0489e621adda2fe856f4dc965843c65c8cea1400d093d7935b2d5e0e9
font_01_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10980 bytes
SHA-256: 9d9b7521cc9442ff7353943ac9b0bf352a1c9faf16373a2e5eef37e40fdb2a8d

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