Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa1fa1cd74e3e4b…

MALICIOUS

PDF

90.4 KB Created: 2021-08-08 19:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 103a78459cfca53afa3a46c2ec2cd3e1 SHA-1: 541bd5cd6515a2ee5dd511a708277307b135a145 SHA-256: caa1fa1cd74e3e4b979912ec5121c43503af057e1e33a032a21b66daf228f8c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics confirms the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://catamma.ru/uplcv?utm_term=adverb+detailed+lesson+plan+pdf PDF link annotation
    • http://lamorenj.com/userfiles/file/bizukabexogubewozok.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/luziriwosixawanig.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/28382494208.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/sopigivotoj.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087015ae5955---74530708486.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/xolozawo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/sixajufupawuwelawu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16091517e85153---80055777192.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/426b98fee7edd184d33ace942c72504f/92053721966.pdfIn PDF document text
    • http://artospace.com/pics/file/kakevozotolemak.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35fe4c4a31---tulosubawevajizasowu.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/33054489199.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0334d6f45---37180398861.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4d0ae34f---19742115992.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/95836327628.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/magijefuxomog.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/nodupogelozakafopoxix.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d85h7rl7m5ucvq352qp7ilb4a0/fafojotavomebu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084df64e084d---66731158173.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/90067316091.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/89731588807.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/xatutu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sijapaxatofeso.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7eda670a5---baferulorid.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/sefeki.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_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 10676 bytes
SHA-256: 2f22c754e9cacce2fe98c02f91977ff87c7c60073cfc6b90e5003df1cda965fc
font_01_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 16636 bytes
SHA-256: 10a532e3009504a0a07527b0548ff970c41dce54433936180dabceee6aadc40a
font_02_sfnt_off000143bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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