Malicious PDF — malware analysis report

Static analysis result for SHA-256 057e541a5270ec99…

MALICIOUS

PDF

84.4 KB Created: 2021-10-13 21:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 910f6cc637d4e3afa9747d12afe402b8 SHA-1: 5350e5b29fe00c1a7a0091d25eb98870494ed128 SHA-256: 057e541a5270ec99aef5544f704ea8131ed54e5c030a37f3026fd4b9856b3f44
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://themetamorphoseprogram.com/userfiles/file/suvezesezikozogoperexumov.pdf In PDF document text
    • http://totoquynhhuong.com/upload/files/24890874331.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/bejuwijepo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/89298fbbe1e5fa1743283a2c6a884734/73552854078.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210926014815.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f19bc4d18---loradolemerap.pdfIn PDF document text
    • http://zenithmetals.com/files/94635258509.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/naxizigod.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/numifedotogivuxejub.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/83371881030.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/1773669557.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/12927759268.pdfIn PDF document text
    • http://nature-revive.org/files/file/5080183450.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158cd93bf44a---58084975129.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/58858363039.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/mizonujefemus.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/4520930461.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210903_718A769C2B895B2B.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/47306839285.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/tonavixigapimalixibebuzak.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/4922580003.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109240937239743.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/850082958.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/lagesaxusevosiromoned.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/tukikebamadugo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=non+conservative+systemPDF 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_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 18560 bytes
SHA-256: a87d1a150e53016c4605f0bf863f1e89111a23352b9bead31caaebb9b6970098
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 10500 bytes
SHA-256: e9d312ea4938d81736a431c7f2aaadc6040336cfa318d740f2ce2a5117d85881
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1