Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaec9e80ec86ba73…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 12:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaf61c32e27bd0bd0a1e8f59fdbcb9c6 SHA-1: 1ae8b7a455407a0f26ba98521c028f7ae4cfe8c9 SHA-256: eaec9e80ec86ba7349b5b09bcea9c8ac236f68459921b479b588a257254bf9eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=apa+style+in+text+citation+7th+edition
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/aa87c3307b5d34f6e1f36756324600c5/37136739202.pdf
    • http://ainut.fi/userfiles/file/sisisite.pdf
    • http://toflight.mobi/attachment/ckeditor/files/f9d9e7a5effc637804a11b225928a25b.pdf
    • http://omatsuri.kr/data/userfiles/files/18727644400.pdf
    • http://xn--hh0b97d8is16e.com/userData/board/file/64457082072.pdf
    • https://orrizon.ru/images/file/85975348281.pdf
    • http://autosoftware.company/autoresponders_images/files/pojerotutekipedo.pdf
    • http://www.dereformasenalicante.com/archivos/files/48811240091.pdf
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/62388364127.pdf
    • https://shatalarab-llc.net/userfiles/files/nokumurimoxon.pdf
    • https://lasanisports.com/files/50614017908.pdf
    • http://htcable.cn/d/files/93457734398.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/parodi.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/325ee93b3a00aaaba2e978f95df34d35/mibaxajewenuro.pdf
    • http://innova-perila.ru/upload/files/xaber.pdf
    • http://papierplus.pl/userfiles/file/65593161391.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138531888435---94158833575.pdf
    • http://samtle.net/ckupload/files/tikepirunabifufamalik.pdf
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/fenaxevizabub.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/babuf.pdf
    • https://muratay.nl/userfiles/file/dodobinorusaji.pdf
    • http://doradcyprawni.com/images/pliki/wikilimudakadasugisawix.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/kupututipibeweda.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da36.bin
d7c90846fa4567581cc5c781cad5b4f654bd515162eea2625cfab405b1ff737c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 18060 bytes
font_01_sfnt_off0001089d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 16792 bytes
font_02_sfnt_off000120b4.bin
1d673af8c6e35474a9139195b0a5db8b5ed2c78caaa6d5b4efb237d1a2d3baf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 10760 bytes