Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbda718108e724d…

MALICIOUS

PDF

116.5 KB Created: 2021-08-23 16:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 796dcb897383e149714c6282db20e96a SHA-1: 10bf8892de71a948200fd16b70643666201fc7a4 SHA-256: acbda718108e724d92de1e4dcfce7a21b866f31c27cd0c632456bd64d8ee6274
156 Risk Score

Malware Insights

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

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 many embedded URLs pointing to external sites. Some of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination or leverage compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://munnarinfo.in/userfiles/file/xetemefogazopawobaxo.pdf In PDF document text
    • https://principesgs.com/userfiles/file/59077858630.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f393433cac2---tazosasasewaguju.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/87092905296.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/14084082304.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af723c549a0---bufuzokubokawipevawaritap.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/99616342383.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/mupipewejewipa.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/nufunojesab.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95ec7d988---95687924197.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/retibavavakit.pdfIn PDF document text
    • http://gapp.fr/medias/files/luvukeka.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608361dac59f5---92998815118.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/58688067798.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ed1516729a5400d7cd68cd4d95708c8/zoduvurimewuzorefevise.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/11934060537.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/xunafikepizunujuxet.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d36f438f66d---tizobuneloramu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968bb79800b---75260007347.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/41285735335.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/xukufowajoxu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/rizudolewiwozokad.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210609220133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=drake+most+famous+songPDF 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_off00016360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16360 10612 bytes
SHA-256: 14a71f41bb0f66dff971bee2e4f357501c8f67d3f29dc49cbdeeffd5e8381d43
font_01_sfnt_off00017bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAD 17760 bytes
SHA-256: c171ce627a29ef5dcd8dd07da75558eebc5c072586ab8defb86a8d571ae8b0fb
font_02_sfnt_off0001aa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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