Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fba89284af130f…

MALICIOUS

PDF

99.6 KB Created: 2021-07-02 01:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cba6d7b1489b782dedbc8c8833f971fd SHA-1: df5db9e089931c80bde06d040115780550e071b2 SHA-256: 64fba89284af130f4298d7f3d71af27db569f83966beee0e7eb94d1b7f74acba
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://pistant.ru/uplcv?utm_term=cry+the+beloved+country+plot PDF link annotation
    • http://albatrossmrn.com/konadnew/userfiles/file/17996701079.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fupekolomabukivukezosu.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/lujolaxobexoniveviludezur.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/diwufinexebuzo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/83c484e9da265c6ff7dec93ef2161b13/todopotekokan.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/79226745436.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/j2o7l38dol6veor1l6oaoo1kaj/fakuleludagumuf.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/023ec5420234ee9186aa4fba36ff5136/62521683812.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbca7f22c---94645681387.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/65866428049.pdfIn PDF document text
    • http://amdind.com/userfiles/file/letebogane.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/giforugumu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c40e2ab8---30715497751.pdfIn PDF document text
    • http://springbook.no/files/3002600986.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/59239395215.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mebar.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073150d439c1---jebamufizabaxugasixo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6bcf62f2434584e5815814daa844893e/lizebuzulitosufigeje.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/52101989300.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c9b8a328f088c2e3102409620b9580e2/44825071151.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/96687836205.pdfIn PDF document text
    • http://yanartextil.com/firma/files/bebatavuwoz.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/16638542226.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_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 10640 bytes
SHA-256: 3f6213fe6159e9706807c69863146dc9f3eb61ec30ae1135f576dd225325a039
font_01_sfnt_off00013dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFC 16872 bytes
SHA-256: bebfa49d95af703641c2e82f700925d01c315d152d2d8e8f583cb00f7c314936
font_02_sfnt_off0001694f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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