Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f32418f856e936c…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 01:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2f3f91dc7c14f5f8beb3e6ff325dba4 SHA-1: 6db46bd528f74cef557acf48d4cc4b01621bfa53 SHA-256: 1f32418f856e936c5f6c9912ba32d603f0e904b075f0ad0f9199671bfbe68411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vboekkdopqusvbhkf3q116vl9a/wuniwer.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f505e3e5e---didoxulelurof.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df741391e---paxid.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d2888374---44999403903.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc84edbbf---vuliwi.pdf
    • http://ancoraeducacion.com/images/37207207903.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/qu2a5e75ghgsv0aor2s787qs14/vapivuwasunapepiwovezot.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87e4e9e87---sosikemokesozumisogemifux.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/59634965389.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d137bcaa931ae96bfc131b9adcdf401/wositodifolorurowajavuxa.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/6c0bafae6603377a3ca5eec71177627d/14917581839.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cefc507d4d3---negiwenokotorakexafem.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f740ec0c682fc1bcd51f88535b7ee132/21353153095.pdf
    • http://apexnepaltravel.com/userfiles/file/30801645866.pdf
    • https://study4student.com/cache/fck_files/file/bisevadozep.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/610acf74e87554815ed89b12ddba3620/18751971478.pdf
    • http://nusamulticentralestari.com/Uploads/userfiles/files/zubitovidut.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tmhc8fakrpjk68ipbd0j04t193/41015795804.pdf
    • http://accu-chek-event.com/ckupload/files/43469024919.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7375eaf148dd805d55936e267b944958/23386742593.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607033856f373---83441551776.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609630ea9383c---relewolalegu.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/poe2n1ulrsicph5eofbl3mhv16/vasexodizawiku.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700af17f246---busalawi.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759ca5a52ce---zetevosa.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68d3d65be---totolevisazifiwet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+puppy+is+still+hungry+after+eating
    • 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_off0000fd0d.bin
9865d6c37498ce90e6acb42e73f75d1623304b3c63a5a1c341347d90bd33dd9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 17088 bytes
font_01_sfnt_off00012983.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 16792 bytes
font_02_sfnt_off0001419a.bin
871be96a968b920221f325c30aaffc6e476457332f8500926cf003998e685a53
pdf-font-stream PDF embedded font (sfnt) at offset 0x1419A 10724 bytes