Malicious PDF — malware analysis report

Static analysis result for SHA-256 950c99706df350f2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 08:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 675c2816675d2e9be58d83dd61592c13 SHA-1: 191947164eab94786b99c83dc55ec35f9fcbf962 SHA-256: 950c99706df350f2fe15808fa9b80d05d38db26a2836097958bc0cab34852905
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs pointing to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.chubsorn.com/file/files/kivexaso.pdf In PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/30924742456.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/75c94eb2c93ded0cb7de20a432315833/18080968062.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/53349960564.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3a6349b0607dd600b860a19ba39667b9/pujejodolomezezosun.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/93537143796.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65db0681---70842126798.pdfIn PDF document text
    • http://budka39.ru/files/5248540206.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd76a22c4f---24965878257.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e7e4d36d---48490007501.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/83798875931.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jfstr6835sg6iqkgkqh8nqab7b/jirinipimibunuv.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7b8511670f0040dac522048f9982936a/44894143316.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083a081ecd59---82202326674.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tisolixeparipo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/14c692b49c06539e41ffaa04c57662b4/72534507060.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tagisazeganavata.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b812026387---425782624.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/40354059457.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/rimadodixakupuko.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/konokajurixub.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb34c74914---pujufoxagerobuzujas.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/fe18gb1lu75omo1ek5ue2ovc34/rogujukovuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=toto+africa+piano+score+pdfPDF 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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 19160 bytes
SHA-256: a3f4367ef01df8d79753b3fb1dc49588dc85d6a53f07628dcd90226eb36ad195
font_01_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 10528 bytes
SHA-256: 79a23a503a86c5c9e6ad8ac0dd7f06383a8cd813562993bc4a499d9f3fc1a723

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