Malicious PDF — malware analysis report

Static analysis result for SHA-256 914f2f9195f8c2c9…

MALICIOUS

PDF

91.2 KB Created: 2021-10-12 00:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 082afde52092835deaea4c5c3518ef6a SHA-1: 3a7cf886f182a1b9e3199bcce5f499910f82b986 SHA-256: 914f2f9195f8c2c9dbcf8dbfcf2c15269e90fed22168cd2fd3234651da6f9b44
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 websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://motoralbini.it/files/file/57643632629.pdf In PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/mepitatibizugazosamem.pdfIn PDF document text
    • http://benly-carson.com/product/files/xalix.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/49989107386.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/14341110942.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2cf6181otlsjr10ndep9jc9704/79805982095.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614edda762ef4---lubaragi.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/dujozu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kuregojipoderukazevomo.pdfIn PDF document text
    • https://rotitelor.com/contents/files/70101109539.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/nepelebugekoxuzib.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/54482131977.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615de3d0ca846---48542998680.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161570c570e574---95119969238.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/dizowosilejem.pdfIn PDF document text
    • http://delve-cr.com/uploads/62460989950.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1616134c74afe4---jolowofejataves.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/17951694695.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/85741265807.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/lazakuje.pdfIn PDF document text
    • https://majubesar.info/contents/files/20179246792.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kovitumivemojege.pdfIn PDF document text
    • https://naves.cz/res/file/sebimuwewiverutufo.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/ditonafogefag.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/29873709552.pdfIn PDF document text
    • http://regmac.net/userfiles/files/josuzavix.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=counter+strike+global+offensive+apk+androidPDF 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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 11104 bytes
SHA-256: 97f736b6af062ba4d9139b5df3c46780752cfa91d0213530861b00bd91e17bd5
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 23256 bytes
SHA-256: 90b6e1def53bdfb7337425fa08cea8c55d4b725b9c6aa500b3233e98a5aa50e6
font_02_sfnt_off00014721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1