Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc481575d45c5ad2…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 20:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1505623f26a03ea72171be50ab6baf3a SHA-1: e699416e6366aa5e05d9212a92e290a6ea1fce1b SHA-256: dc481575d45c5ad2a5ad98dabb0b4ebb182d93e6345ecb4d0901cc08cea911a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ventsistem-bg.com/userfiles/file/8305790694.pdf In PDF document text
    • http://studiosantese.eu/userfiles/files/gutexijebimiki.pdfIn PDF document text
    • https://uangraja.com/contents/files/loxatalek.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/ratazezivedo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6f46babedcf2b49b6f7bb91d06b10792/joduvixugenoxikufisutu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d63b80e31a1---64040699156.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/demumusowubowilax.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/344dd440c379a7db616380fb385670d6/3758672311.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/dimotezawitamotefufolel.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84bacbe21---88696342161.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612939cb0d08b---zovagex.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/jtt7392q1va99ejslvuu7utfpc/lalutarabupagir.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d145e3ccae---32536021113.pdfIn PDF document text
    • https://cecprint.com/images/file/migaxoxetinis.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf39a8d0aa---pukefumejurarelefaromutaf.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/divufaxid.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/33868975494.pdfIn PDF document text
    • https://siroyensao.com/upload/files/87398195629.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/89139529168.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8a630fe1f---sodogarawogubavufisoj.pdfIn PDF document text
    • http://premo.at/userfiles/file/fetodek.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/wotanududotewagazifiwila.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/50128549414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=drilling+and+blasting+techniques+pdfPDF 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_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 19488 bytes
SHA-256: 3e434d0c2c10a34115dce46608de4dc0661f554f0a590998107b58fb0fa30d29
font_01_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14582 11168 bytes
SHA-256: 3c3f1163c2312797f49a77f6da2e1b06d6889d3bb6e97512ff18117770f29945

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