Malicious PDF — malware analysis report

Static analysis result for SHA-256 550286ab3c0d176c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 05:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1fe373f20b6718a28c5df55f1dd9e59 SHA-1: 57a720be86291b5f0cdb08d539fc9edccc2f6638 SHA-256: 550286ab3c0d176cd4fd6c7b99b3bfb88bbebacb70e71c4ae5e3686e7681b2d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=free+download+photo+editor+app+for+pc PDF link annotation
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/10879513912.pdfIn PDF document text
    • https://sergiomauri.com/images/file/60900106136.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1ab98038---sivepikukutogarenotax.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/33202154927.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bfc8215d---73072505995.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/batezelujiwofuwikupes.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/muvurejonipu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329034d1a05---98051118667.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nemujodamumur.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/runosilek.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/keviwokud.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/9920576218.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/rizoninivoporibo.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/buxetutuvibigakonufawat.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091413563343.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/xoxedakaximugatozuma.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/koveruzetububexagaze.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/39615696916.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadezoxixonuvevelotofam.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/86256388944.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/velaxizawo.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/reronud.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/88358592391.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/17116950498.pdfIn PDF document text
    • http://coachhouse.info/assets/file/52390387423.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/44324596448.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_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 16296 bytes
SHA-256: 5c0a3b43be3c75f67c0724617e95036cbd231c23275a9ebee90a2c8918d9898d
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 10612 bytes
SHA-256: d7367e44a018486412ec23acb83f7184e9e482d47c9dbe2f6daabacde8b3b21d

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