Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9757ee9d446064…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87a23ac9a61be222aa7bd8cb2ae6bb7f SHA-1: 36214cc53cb61e00d167566cd17e59522c353c6a SHA-256: df9757ee9d4460644dde93c9cd1d48f27b37940d5c292c7a220b97d18bc94ad8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of links to compromised CMS uploads suggests an attempt to lure users to malicious content or downloads. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4a02de2be6e1da6089ba27db63331852/nupewejupiwada.pdf
    • http://omgmediatank.com/userfiles/files/wuzizumutomojikemorezogi.pdf
    • http://jgbt.us/pds/userfiles/files/14595503741.pdf
    • https://petribax.com/userfiles/file/sarasuxebumil.pdf
    • http://karcannakliyat.com/userfiles/file/talen.pdf
    • https://chongtham68.com/app/webroot/uploads/files/44133484552.pdf
    • http://dreiseengrundschule.de/files/69636504920.pdf
    • https://costabravas.com/uploads/localidades/files/pexuri.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/83b3d5d07f62acf35a934e78d4bf34f0/tukapidawofu.pdf
    • http://jj-metals.com/userfiles/file/2021090613124473499.pdf
    • http://lumieretvie.com/userfiles/file/xipabos.pdf
    • https://guijek.com/userfiles/file/woras.pdf
    • http://dinskayarealty.ru/media/file/watubiludone.pdf
    • https://uudanbury.life/files/file/14153282467.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/9641257630.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zulegigiberolaluwo.pdf
    • https://dalycity.com/wysiwygfiles/file/60294214188.pdf
    • https://nmcs.ca/userfiles/files/xilurirexuze.pdf
    • http://deepakbatteries.com/uploads/file/josalabuzur.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/522083a1526254af08d239c4de110586/91001638832.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130200dd4e36---xolivuwevepamotadan.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebojumajapakusabulogufa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sab+kushal+mangal+watch+online+123movies
    • 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_off0000bac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 16792 bytes
font_01_sfnt_off0000d2df.bin
96a711552d61ca7c0f2c3628a43f7bfe9117c7ddeed652afcf1d76028794579c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 11480 bytes
font_02_sfnt_off0000ee07.bin
05473644a6473374f6376f403fc21a4ac401f89f9581fd0159a1464ceaaff757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 18708 bytes

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