Malicious PDF — malware analysis report

Static analysis result for SHA-256 44074ebb433fc621…

MALICIOUS

PDF

95.3 KB Created: 2021-10-10 04:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7b83e45b72152b31c737808a27a30a2 SHA-1: 009fea4d01f76c351ff84df1c862ff82b1fc941b SHA-256: 44074ebb433fc621b024a2e5ee0b6ce9ed4cfaec8358504b46852bb602ba4ba8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these are common tactics for SEO poisoning and hosting malicious content. No scripts were extracted, but the extensive use of external links implies the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://synerhu.ru/uplcv?utm_term=osprey+packs+owners+manual PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/710cdeb565c1375a993b7e361d8959dc/gazitewutalefuxolopow.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/soremalupatarajujuragano.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/godvt82fbkpvjfkmju1u4e8odv/suvuriwaxaxugurizetomox.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/vipudojegurexukobawo.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/notusemiselaroxig.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/75381287341.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kigk6ghtl87gpvlae7tu18tdc4/vimozutukedogufakajaref.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/95727712954.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3faaeff7---21839989771.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210923_6F0F5D970589E1F4.pdfIn PDF document text
    • https://peterdegendt.be/file/taxikepodimifu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139391467aaa---86436868840.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/31017509201.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/sojitari.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/6893251258.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/41573578530.pdfIn PDF document text
    • http://desirepara.fun4two.pl/uploads/assets/file/dusiriviz.pdfIn PDF document text
    • https://krossi.ru/images/content/files/luputer.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/hQDoqCjMBpV1.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16156c037627d5---45244734382.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_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 22184 bytes
SHA-256: 2c5938f7cc979eb9a8cd005140f793e75f40ad711fe369f0fe70c051c7de5afd
font_01_sfnt_off00013e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AB 10760 bytes
SHA-256: f27c68d2b58ca2dfb5f4689db347ae716bd7f2c0f53741073d0d0f349670ab8c

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