Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaf71b1ff5e52a6…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 02:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3d7d95db5260d7f1a3e7639b3c0aba3 SHA-1: 1a07cdef01dbef82867f6e75f82485402998f05d SHA-256: aeaf71b1ff5e52a6d9db45507134b846dc921d521d61e5444f873bce97ebc4be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=grom+audio+usb3+manual PDF link annotation
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/marekagunipesukafi.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/19864229850.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/9481582137.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf41b617c7---28112926160.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/73158056220.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/94559845806.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/26240555104.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f50b96925---26433000950.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/dasanizidusizutidozukope.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb97b9481---gijapojivanuru.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9858847b225bbdc0bd08fb17083ebfc5/32786807891.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/wudewokonakox.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3150c93f---53082115728.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/31042559442.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/17243178105.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/namexevo.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/78277787374.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/kafovojesifuragavoladefiw.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fuzuwoduvobi.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/27183094652.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161042df67c15f---tokexipokoded.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e59702493---funekoweb.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b16e6146a9---15078303413.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/dekavobunoguj.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/robipabudumitoge.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/janokibuwuranufogapemabe.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_off0000c43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43D 10628 bytes
SHA-256: 3190cceb3511d84c09e9274fceeed477898e264af0b92c15016dc8d9659a9987
font_01_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 17176 bytes
SHA-256: 2fcb2f9b0a098c155d4c16628a0c5ce09f29c405bc1bf23e0114e4417fb3bbf8

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