Malicious PDF — malware analysis report

Static analysis result for SHA-256 da62df72bb543784…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 19:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b24f35a03bfff91a0b6c331509ff2ef SHA-1: c04eed61cca4a77a463ba5b71fb2df2e1e017e42 SHA-256: da62df72bb54378462d06a2df66b7bce9dc565c0122320dc30d213bb4189b1c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress upload storage. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://varosom.hu/userfiles/files/tetawisofuwerasuja.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/wonitexelazebomenaguxo.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/74058526244.pdfIn PDF document text
    • https://austarpharma.com/upload/files/631279977.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/wewogekopifuxaro.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/muxisilafebilogodiwugi.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/lunubilel.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/rudiwu.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/19505564282.pdfIn PDF document text
    • http://mobilenmr.com/files/files/95604277216.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613663a730073---50776044879.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c7df1fa9d47edae73c1adb2915a63ea/71900336854.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jiafp535o6r3tgp5vor1rcuef2/78211907226.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/19272637603.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/18653910974.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377dc20bc57---razareditiwoviza.pdfIn PDF document text
    • http://gysanya.com/upload/file/210908124225666072zgr0zwrn1hx2.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bobosilenekexoxitavexenak.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/goluxinukazetikesu.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/nopegodawenojake.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/nekazer.pdfIn PDF document text
    • http://bndweb.nl/upload/files/fakigunazu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534d82df3a---91802280918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ludo+club+mod+apk+unlimited+money+and+cashPDF 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 11084 bytes
SHA-256: f9a190f379200f4ce2b7323bbb989b020a971ffa70643b5a7886e6678af75c2e
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 17580 bytes
SHA-256: bcb65053f49620ac775482d6a4755a8c236a8a995a53e919553a4be6bceb27fa
font_02_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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