Malicious PDF — malware analysis report

Static analysis result for SHA-256 d562e2cc77781942…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 00:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3a663e8735ae16b30f9c8abfd09a0b89 SHA-1: 5d5c8a71e438ddd9d5b45ea583330bc4ddc0e6ea SHA-256: d562e2cc777819426d12adbb9c46890ce8ba9b0dd9250ca00bbf1d83840d1f38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics reveal that the document functions as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting services. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://polimak.pl/userfiles/file/fusev.pdf In PDF document text
    • http://security-m.jp/tool/images/file/38485990241.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fcb481731---zenilixaped.pdfIn PDF document text
    • http://handgun.ee/media/file/milagunadakidabe.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/soxufuwul.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/vodelafejotuledafejefowe.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210902_123411.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/83823002966.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109020921286090.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/likuletubiruwavo.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/jetakipizefivemezaxuwos.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/38122823679.pdfIn PDF document text
    • http://hocomesun.com/upload/85280372814.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/tisofusabukugimelegalo.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/sixatojuko.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/renewofadimoxulelosetuza.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/dofidos.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/bukimilu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6eadf717---96866023830.pdfIn PDF document text
    • http://soupworld.de/upload/file/91256486813.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c8c6a05c1d1c2b79a6ebf75cf66060f9/kamapolitatopubedozi.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/15753461438.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/19613285142.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wuvuvarogaxafobowaz.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mokebilivuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=y+destiny+the+series+ep+1+eng+subPDF 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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 10732 bytes
SHA-256: 5d99a57aebe95b17d0f6d40670fa119ad457d23da890eff4825c592e7ac96adb
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 18696 bytes
SHA-256: 1230c1a12f193511eb3c251b0ad622d8426f52d3d825f94ff87f52de399d630c
font_02_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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