Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28023983f3164df…

MALICIOUS

PDF

92.6 KB Created: 2021-07-04 20:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 948f0da54ecbcd265fc86be552e3fe38 SHA-1: 0aad301e9552893a7288427628e76fe87885faa4 SHA-256: d28023983f3164dfe351de4974d23cd1aac03a83cd1150eb1f676d8f72b242a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609096e60124e---pabexufare.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/37558996949.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3284f17e---zatef.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d65bba9097b---28374775142.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace8d0f347---sixugejamijaxivujeje.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b31b693f517---78996987743.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc68784559---mabodefewenivuralokiga.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/upf6i6a3c7mtk98aqlivqouokg/bujinejotole.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5c81cbde---75855697580.pdf
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/13774659932.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980f3ede4ae---90501848258.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210616064427.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6211bed502---62631578760.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2kht8ndeqflqbu2r5uur69c2po/46166971567.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bad8a1e74---63060401518.pdf
    • http://biotop-zamosc.pl/userfiles/file/477508952.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd2b6e636---pugunakojederurulopovike.pdf
    • http://school19-zav.ru/userfiles/file/94846036442.pdf
    • https://mclandpin.com/calisma2/files/uploads/pasokeji.pdf
    • http://atthaya.com/file_media/file_image/file/wajesumikurunujixal.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c966a7e53c3---74569699936.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/66a7f8dc59f934eed14b56ca4e4e0f18/lutara.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d04ad02f364---nujilami.pdf
    • https://theatresaucinema.fr/uploads/file/pazivoxumax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=average+japanese+female+height+and+weight
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75f.bin
187527b444c1048804b79c7f9a21730a0f9980154c66031c4359d0aacdf81668
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 11088 bytes
font_01_sfnt_off000110d0.bin
2a399d18dbc5e5d5854f116202c25618ab24ceee255fea754fd64744cea112ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 3200 bytes
font_02_sfnt_off00011d86.bin
7ecab6159e0aa9101dae787133d8d26dd7ad1f9b03a64de85ab589f074b7c3f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 17124 bytes
font_03_sfnt_off00014a7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 16792 bytes