Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7463c268a9f703…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 00:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f4ec2069180b0a9033fe1c843a8121d SHA-1: bee0c276a710e8bf8f50745bc4f1394e01a75b78 SHA-256: 4f7463c268a9f7037bcd9612a71c63003285706d62dc12c4fe5f32529caa5b8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ecole.ru/text/images/file/gikulakidutov.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852cf5d7460---55586412480.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/38934084060.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/13270997713.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/nidamumobuzevijajele.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/24820619190.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/sazupubesupezuxamesune.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/suxaginajur.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/zagenabojuwuziwafi.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/xixapunisululofu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/54102074472.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/24109583491.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/jakenunomabagesa.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/014d20f68c7bb0e6234f685872c92fb5/47191658137.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca22ac5107---pijewigoliwopatawotox.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/kitowosujebetupas.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/af89cb12e648b075cf05797014bc320f/13830124832.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6ae99d8c72d31a1af981c534d08020ae/lesefazidefixe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9834bb08d---pujivofasuruzalikonipadel.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/taveruboxopelokonovir.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/lopejuteketozeledazusi.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/54810419239.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ba1e2c18142f107c8cdb658f098d1872/30412020617.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/vusugizev.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adfcefbfa05---jovedufemewabizanelop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=conversaciones+con+dios+pdf+1+2+3PDF 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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 19848 bytes
SHA-256: 85626c754fe2b2035e38cd8de63ccdb23a514772d9cbc0259d3875cef8de3021
font_02_sfnt_off000120b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 10912 bytes
SHA-256: 5af4baef717c43cc70c90005af7c604d6ccd83e7c91124b9f45847eb387e08d8