Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a700e37f276f57…

MALICIOUS

PDF

120.7 KB Created: 2021-09-04 21:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cb92ecc6174d7e40c2ec11e1d0ee031 SHA-1: 1c3b5ae685a487d7b4dd5527d5cb976c23f4651a SHA-256: f1a700e37f276f571124f812ad584f505d7cc24a958ebaf2e90fc7c04428f4dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://www.benyowsky.com/resources/files/54117171054.pdf In PDF document text
    • http://dansungsala.com/uploads/files/35357371540.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/6984193800.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/66966360237.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee77f0f87f---jejiwumimilani.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/wopof.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/zuluzekemojow.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/91965240374.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/zupeka.pdfIn PDF document text
    • http://seamacros.com/upload/file/85289602775.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/40029700136.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xesofewefa.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/13825972866.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/48311376476.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/23112920286.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c903d5aa23a12b82266c6539fafe8917/47642006511.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/18718435659.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/83416321561.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/91378302091.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608522b83454a---pimuvepuxomuweko.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/serabixejixutadirod.pdfIn PDF document text
    • http://toroisg.com/public/images/files/19604820618.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/fbi17ejgfhki084l269sjs4qat/januvujekul.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a92a1290---10494833313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mahabharatam+shanti+parvam+telugu+pdfPDF 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_off0001741d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1741D 18504 bytes
SHA-256: b5ede2be350189d4eda5c506751aa7944bd34b010ab921fbd311a3649d1eb68f
font_01_sfnt_off0001a35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A35E 11124 bytes
SHA-256: 9c8e87c81a134b43b3c375d438a51f2ade35c5774af5d92f3265b5868c5604de
font_02_sfnt_off0001bcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1