Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38fd5efa64a90bd…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 06:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b27dfb170a6b89067239870475ec4df SHA-1: 3a6ffb95e1dfd835d62da8962c40c333a84b1248 SHA-256: e38fd5efa64a90bdbb97fae0a3b734bc28165f69704912b751e1376fa2605a3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lifebeachvilla.com/uploads/image/files/porajorikezi.pdf In PDF document text
    • http://huspanda.com/data/ckfinder/files/xibovirej.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/9260534613.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/bexavolajopese.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/gujevilikekejebuner.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/77838471518.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/jevifixirudifipofobum.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f33d89b1d---neposuzagemimexe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af301ba49a---96059364512.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/foxeteravedalawu.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/womunabarajuboresujudib.pdfIn PDF document text
    • http://superazs.ru/images/news/file/50156755929.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/77137040209.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/110852332633.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210901212011_lp7s9g.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/28126067043.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/16010025898.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6003491f---tagima.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/tiligabob.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/33060680962.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/34601455851.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/68777538278.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/83502009584.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wijoferasibigu.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wifovexafugen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hd+video+calling+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_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 10480 bytes
SHA-256: 590d48d2361cb6bbac026ecc7cefd3b1619d57fd9353a8720981f8cd4cb89f02
font_02_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 17472 bytes
SHA-256: 1af12a807378951bdabe0f1bcfeaf3dce881ebdbf92ec69f428b9f0cfa272ccc

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