Malicious PDF — malware analysis report

Static analysis result for SHA-256 3261553a89a4249c…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 22:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec3aac499b34e0f5516723f7e68727fd SHA-1: dd7d5db182a304aa414867fc38a9357e92c42b6e SHA-256: 3261553a89a4249ccfe1bebc8cf3c8a75cfee1daaad0fecb3618f63134b7f52a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40ee9af53---kefogofubofisinowev.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49ed996da---fidizorubinekifajilasu.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16232452326448.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8088dde88---visepokaxijisoxowuxedo.pdf
    • http://accessprecision.com/userfiles/file/27371773124.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081055e56fdb---34866263441.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/84843408da1817156c057f91dbe1193f/21571345565.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/42e2e26895875c8020640d15477b2e97/mozalapujomaginelexanim.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/54b1799fa8e840bd88898037393cc53f/41900915350.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qichll12v1bkahrmv4547ntev2/gotabegixiwa.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce89cb763---31510822351.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/3129cdb30a701f2b3567d5cfddfc3344/40179618474.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7852f1b4---87453668144.pdf
    • http://martom24.pl/martom/userfiles/file/ratatewujowisa.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/87bf3f1c0bd1b5bbcded6bfe4e2268e6/vimoxusivosok.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ccf3f815---42957584455.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb66b491ad---59135542902.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/41hhp3f2m5745ei8mpli6gce5v/17668640062.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/35beb24a2b7ad1832de5088672ddba4b/komekajogigipowem.pdf
    • https://augsburger-dartliga.de/uploads/file/susogiv.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d60a196b13b7b6999f1d3f95e58c448d/fenavudozu.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jhma14sjlkphs5l5re1v5rmc23/kopiridabibewa.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/tokozevuposulokix.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52dfd5d5fe---30478784063.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=friends+of+notre+dame
    • 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_off0000f4e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16792 bytes
font_01_sfnt_off00010cf5.bin
f917dc3de771e38b9bae9a17b2322c6b7ba6d268a2f0e3227b8bd6c751e398f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 19872 bytes
font_02_sfnt_off00013fc1.bin
25148a3e9027c0558731dfca2f2af8d4cb83df1ab11cb85c8f44c67b1c84528d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 10448 bytes