Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd7131b324ac60f…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 00:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bbb936d66af6567053501d8c50848d50 SHA-1: 5f840507e6839c2d544867783b384fef07aec202 SHA-256: ccd7131b324ac60f52f139ab5fc0838ef173f3c9c18264b716d2d0861d7f7646
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://classicalgardenornaments.com/uplds/file/xorogusanaxubunezokokug.pdf In PDF document text
    • https://dynasty888.com/image/files/20210616_053342.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fc1c85d---waxelokali.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097de813233d---kinaxok.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608927151f27b---8342552800.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/seduwimivepikizididatiwi.pdfIn PDF document text
    • http://samtekelektrik.com/files/57633434802.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160859440343a0---jotaxirukesu.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/ruzuwotogubipemevinemoket.pdfIn PDF document text
    • http://scro.ru/pic/file/nagibowupopura.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/15837148896.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/dcca3359830bdc18d96f8b5f36fb7e6b/17584716314.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c0c69a768be53255daa33c202319e4ce/fapikosaka.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9821d0caf4---31559064510.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d51e1b41---wuvejolilalewosaborefa.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/bb211a9fb1cce4beccde6681922c1f07/68091829886.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/wexit.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f81127635dd56f79fa20416c2141645f/jivaxabuxawaj.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160acea385abd1---wumazopuzesuv.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/sofot.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5b64f559e6ae0fa0c8a71068abda63d0/zojujisijupetaparajab.pdfIn PDF document text
    • http://www.puhito.hu/uploads/bugakamawobefixame.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/tagikesozidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+speak+to+the+devilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 19064 bytes
SHA-256: d39977f388866627283e11c1d4f077464aa9a7457620b1bdfeed5b1a424176c3
font_01_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 16120 bytes
SHA-256: fc96bb51e68212267b34b5acefce01e3ce1e469c7be8c0a453211fcdfa4f682a
font_03_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 10520 bytes
SHA-256: cc0c829bc29bb7df4e028e25755419e3973f1d1eb63d9ec69c7fd56da6a83340

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