Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a21359550764ef…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 16:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cb310643e8604c5b63542cdb3d0b10d SHA-1: cfd49de4033caa1974d80f53f680f354329d1c64 SHA-256: 80a21359550764ef7f1685344dfa06dd7e9b4e7e8918a3bcf381ed72b0713596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_07_21_01_2250.pdf In PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/joresiba.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/44562672652.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/91557981415.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nasuwojojexedapajujofim.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a8f60f791938acf041ad94e1d1b9d927/72806361642.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/75824126284.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/27279144397.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546d450f1---2662744384.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/kuguzufuwegorezilorat.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905085810666081mikns5.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/24397045760.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5ecef23dd29d73584068b2d22294559/givogip.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/28622676465.pdfIn PDF document text
    • http://protradingindia.net/userfiles/file/44520675372.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/gefepimep.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/99153188434.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/33511163278.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/9347750680.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/62577198643.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/65197646893.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dipetolejosolak.pdfIn PDF document text
    • https://serka.com/serka/upload/files/litadazibuzasunoki.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/18003592725.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pezutilaxofenaxewudatif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=notification+not+opening+app+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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 10556 bytes
SHA-256: a91f6b94bf7dcfac90494e40036d9a4cb98910c843f8f3897e6670b589847b2b
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 17124 bytes
SHA-256: 75bd00dd32034a29a8f74f3c0b7900abda1e3381524cf1c9b5516f833269e816

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