Malicious PDF — malware analysis report

Static analysis result for SHA-256 630072cf23642115…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 09:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d5d8e75c3523349185488745a5f6224 SHA-1: a90febbc6083f2c1329d48f1795cf5c3ef5918bc SHA-256: 630072cf236421150f126664fe029262f3f93fec9e3d8dfef735cf1cacc42e91
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://wastran.ru/uplcv?utm_term=aporofobia+el+rechazo+al+pobre+adela+cortina+pdf PDF link annotation
    • https://arbormaster.net/uploads/files/xokoxuvegebi.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/43965340858.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/suvosare.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/jamikefitilexigu.pdfIn PDF document text
    • http://cloverdiamond.com/file/zipadijanowufovoterizuj.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/popifukapabanofosenirejo.pdfIn PDF document text
    • http://ceroki.com/image/files/60163337114.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/togemijigimoweridix.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/wamejufefax.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/68941372588.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/biipfqs769c7riov8ughmhmb0n/32107293484.pdfIn PDF document text
    • https://rintrans.com/files/64495669796.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160717e305ca93---ruzagijugude.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/megufebot.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ce7dec96b65f26c278c85afde807bdd8/mukebe.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/38913752802.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2417581a7e248735cb7f541365f6f995/98506896038.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/53638241020.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/70177637540.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/17894894363.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123de6af27ca---71379691267.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_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 19296 bytes
SHA-256: 2bedc9fbdcccea0d774ab6b5be7e6f1eb9dcb61122d9e86cb7fbb5a36b48f39d
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 10732 bytes
SHA-256: b35211be6bca774714f7cecb33cbb056576bc88df7c6d72d23f73556334642c0
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1