Malicious PDF — malware analysis report

Static analysis result for SHA-256 d187871ec1931007…

MALICIOUS

PDF

94.0 KB Created: 2021-08-01 04:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d0262bfe6e4b1e6629e5e92f1477726 SHA-1: a2f52953bc5163a67ee71548cecf1fabd4b1d8e0 SHA-256: d187871ec193100705c82e427c78e1c64d99c8b1659bc30357f320bb500e757e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://brenno-tojestto.pl/userfiles/file/liloboluvobiwarosogomu.pdf In PDF document text
    • http://nuestratierrapremios.com/campannas/file/jagerogudelumewigiza.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ab3acb86---sebopapovigamemofoj.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/retegibu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zetinusiguxevibavifok.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nefewozulelagamopu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/61325209482.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/lorujobejokozaremebu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160752625bd121---garizosudadakefabotipul.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/79046306171.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/vubipum.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/40705f6d642a3fde60dbff168994f0b5/giduzixut.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c49334bdd---kobajixabixerujon.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a31fe7573ec58d7d56b00bd31eeea142/50628470301.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/dilutom.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/juluxuronurekij.pdfIn PDF document text
    • https://loctra.net/userfiles/file/vikiviwejufikerox.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/92678976577.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ehb5vr47ne4m837rjkbhk1j00i/33634565810.pdfIn PDF document text
    • https://irantruck.ir/data/file/18842610545.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/regabuwemogazipeduki.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/67077353301.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/5789775710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+custom+words+in+skribbl.ioPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 10980 bytes
SHA-256: 7f7838010c3297e9ed16add90ea7a5390067d877a759c1742ba4cbce228bdbf1
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 18968 bytes
SHA-256: fab5be1fdccc5ed0aec13415501dee189785d0e5ca0e35b35acad3f3e94f71e8
font_02_sfnt_off00013c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C68 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_03_sfnt_off00015261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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