Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51484fb87ce426d…

MALICIOUS

PDF

98.0 KB Created: 2021-09-15 18:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e0607000ad46df3c01080ec2f7aa06a SHA-1: a6bcd002298a8a05519084e5f89fd4e034775321 SHA-256: f51484fb87ce426d5448a9605370f1c1d00f39c59927438183b05d40574cf07b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The structure suggests a link farm designed to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bijverhoeven.nl/uploads/files/26828115788.pdf In PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3a17848a813b95a49e0ef47b0f415371/nixinorekuwa.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6625957e5409ff743e4a51c8a9b6c77c/68471574152.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uij6b8o7dseolkfpn2sndj9s80/baponat.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xisedaxiwuxakepuvezesuf.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/karatusotudetu.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/71538028878.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/20357188047.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210909140321.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/76171228754.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/kejexemu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/20429648123.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/gekujubolunofumiximum.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/gezaxukilozawog.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/78222550738.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/xitiwobevotetu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410fcbdce72---69926823172.pdfIn PDF document text
    • http://podushka.by/files/files/bozutovubiwofo.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/mirizikaxoliwenelinavaj.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/xijibogo.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/zefafenuzaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ruth+benedict+patterns+of+culture+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_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001340b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340B 17628 bytes
SHA-256: a292596271d1fbb540d646af10198dcb3df58cf41fef1787cef0938cb56ab46d
font_02_sfnt_off00016160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16160 11000 bytes
SHA-256: a50712aeef7b4d8dde7f32212bf73c15abf11e24a3e72fbfe46c5170fc6773e2