Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc76e7bf610a27f…

MALICIOUS

PDF

82.5 KB Created: 2021-07-24 09:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb75f886095919cf00e23007baa358ec SHA-1: 16eb301ef55361343293fdb2360ea6481d04d288 SHA-256: 6dc76e7bf610a27fcec5fb60e26f555f916c32a0d9ff32f37f5e47201a91371f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for redirection. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest the document's primary purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f646e85f7f---keretisupimedipigu.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0f19f81a---kosobiz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ha73n2mbpcgc0ac3g29bslp004/53324884009.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/zuzuwib.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608370f18da0b---13414211057.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fb796f982813c5eb08f8285526a96ab0/tilokabekojovujotukububir.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/64604836806.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0dddf32d6---8258343280.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/5ddgs86gf193et50c0rvcbnn4d/56782296090.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ae68bc582e5c85d25879dc67f4ab8843/kedegeg.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/88591911484.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079899222ba7---49655612251.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/suvofafujep.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/radulijasonovujurosezexat.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/27b729da628c91eb48177b5aa138cfe1/junolasilarigil.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rokap.pdfIn PDF document text
    • https://spacio.hk/attachment/file/26494459726.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e71d3eb7905768f00c3e091a0622a376/25253029062.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/15969803923.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/19060870248fe8a134500c375fd74f2d/faxividukipagupozuda.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/63765178779.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/fipegadewetirobaw.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a949ea39f2b---wajavirotuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=alanur+elifimin+oyun+ljacingPDF 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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10736 bytes
SHA-256: 01fe8883772260afddda445a872c5b56aee27d2d956520bb299757a9e094ba2f
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 18428 bytes
SHA-256: 5959027573072062d65e46b60faec388a9b7c83f02b02a1a9d8c732710445e38
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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