Malicious PDF — malware analysis report

Static analysis result for SHA-256 731829226ad0047f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 02:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0bcd870ae2c1331b8b2e06bc22dd298 SHA-1: 9d4e021dc5816330e7e69e5fea41868940b9753a SHA-256: 731829226ad0047fc19660159ba1fc1839bf163cc6912e7ea3e60788cb190dea
96 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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically flags links to compromised CMS upload storage. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to lure users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=lime+drizzle+icing PDF link annotation
    • http://farashimirooz.com/files/junaxizosiw.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/v9svulrmu2dcft2t65csaupvn4/81474049755.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/58511704067.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ktqef5v01u8h9978l1ihspgsp0/85746230415.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210807_9695FC52360DBD27.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/sh5gtjia6ier0esps39999d4u6/2243309284.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/2890927610.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6dc3b743c---28535575256.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/38469192746.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/mutefasaxawe.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a8e09c93---xupurowukexire.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c03c150ad---tegorazesilexawarojugi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092513606842---57410818451.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/fusabugigirojizuwexujasub.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6871b4be9---57999381803.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8fd981db---repifixidobo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608647c6daad3---9933677519.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/8eb158b2857f386a358d7200f39777b1/tewokugupagesuzurino.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/pebifotuges.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kupibiparefaju.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/86220684002.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/36211799381.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/mojagesagala.pdfIn PDF document text
    • 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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 18156 bytes
SHA-256: 5c5341547e95de854a39e198527547f257aa5656b2ad48de6257c460bf728ffd
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 10180 bytes
SHA-256: f82f1c28a7eab47d80459b99b5e908d555c04cebc8979f2f8ab78785da1dd2a5