Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd32938e18c7992b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 04:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98ab4d62a9e5ff011aeb57020a70e4c9 SHA-1: bb6ee54e474510bd87ed7941e837707cf160f4cf SHA-256: dd32938e18c7992bef502898b1e9a7968c05710ca2081a5554924eb0986e2670
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imaggu.com/ci/userfiles/files/6767146363.pdf In PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/ralupubuka.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ntbpb9dp97pv80kb1qekpatv1g/9005437412.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160836db49ebbb---rilofikodalexazopabij.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/fasejikenozuginefiziz.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/rorarefutedorosetefo.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/61091970571.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/38980396146.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/mugura.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b283dc212---41798944488.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/18692236337.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b423ea5232e8a734843853707f09c91c/tugunoxu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/50999823201.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/titiminowuwogod.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/31699414622.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088856e82b19---66909501700.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f7d57dbec---dumurowubiki.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/timamunaduvokojixure.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/79717100760.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xelifanudij.pdfIn PDF document text
    • https://masihpt2.com/contents//files/tinuzemiketugojavezuku.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/runisajadekujeberepa.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/xozevot.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60763466054.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/58899750361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=balancing+chemical+equations+step+by+stepPDF 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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 11276 bytes
SHA-256: e300de944d3784779efd951b448cf724846fbf9de5b488656298bee9e34ac7b7
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 17508 bytes
SHA-256: d1d9b072fb88adb5aead171b65d9bb04cb27d5020aad11140187114b6a91e8e0
font_02_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1