Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a2d1d7ddb87f83…

MALICIOUS

PDF

137.0 KB Created: 2021-08-10 06:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8f32fd570eecfba853bcf2a24788eae5 SHA-1: 1891e103575a9b858b07306c9459943bc3ca1d46 SHA-256: 61a2d1d7ddb87f832758ea6a981fc8d7673c8554ad2d593da49da3f39261e81e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous compromised websites, which in turn host further PDF files. These links are likely used to redirect victims to malicious sites for phishing or to download additional malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://philabc.ru/uplcv?utm_term=formula+quimica+de+acido+acetilsalicilico PDF link annotation
    • http://studioguidobarbieri.it/userfiles/files/79945164298.pdfIn PDF document text
    • https://parkettworld.com/upload/files/tobuwi.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/wevarodez.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c865f3c8c6e5031facaccd64066cbdce/pidumozemenafodiguf.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6099bde22e---livugukut.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3919dd7d8---79764438029.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97d53cd46---zujifolizevananof.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3683973c2---36558541188.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/90741420855.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859a50a73b9---56446851320.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/xudegikavoxejumi.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/23017890128.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/03faf3911d46ca30532b4ad8321cd1c2/niputuziborujazuduv.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/rovefida.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/42b8c8802174317668c2154acd3ce178/28488242249.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/5475256197.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c52a9055dc561af873cec412c9892c6f/giwisevoronenokefuguxo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24256cbc91---90959284954.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/pavex.pdfIn PDF document text
    • http://funperm.ru/content/file/91573737072.pdfIn PDF document text
    • https://bataretak.com/img/files/file/81194789085.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/26284152420.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d5dda8b7---37828001863.pdfIn PDF document text
    • https://5uempat.com/contents//files/kefoxojawefejiwin.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_off0001ac9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC9E 10652 bytes
SHA-256: 6945e7b0400ed16f4309ef0aca2111cab88e1c229cc8edc9f01fad4a9973ec8d
font_01_sfnt_off0001c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4CD 21796 bytes
SHA-256: 2805e47125a6edca4fa89a1a78d5adce566c01ae45dda85728bbc3ed31bea0bf
font_02_sfnt_off0001fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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