Malicious PDF — malware analysis report

Static analysis result for SHA-256 f653f1437848e235…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 08:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce00b2ea3b7786bd18a90f9ab6399097 SHA-1: 2d3b12dfda270d9c83791c86178637a0f94352d9 SHA-256: f653f1437848e235353fa7389eda920e83390c5e60fd4fe49dace1d964a7f69c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files hosted on various domains. The presence of numerous external URIs and links to compromised CMS uploads suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=more+than+less+than+worksheets+year+1 PDF link annotation
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/877vtmkfmpi1f51filk08r063b/20696702868.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/jenoxaginox.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nhnbrpohse7qs02ntg7tr64j45/zoborunuvusebovugasunuke.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ea58b30e88952708391a459793c73c61/25919082094.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/61681373376.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/xezevasoxijaludezini.pdfIn PDF document text
    • http://ruihuitax.com/files/file/robulizuwepatopexasal.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/99256690510.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/rudan.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jotofotijagif.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/281944496530.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/352140d135614fadde9155177fdfa19c/wosakosorafokoj.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/pizibutovuzidaf.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/jokoxikotuwiga.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608734e0c2089---31680692304.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607081f686ecd---tumovimo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e1e92333ef4714ebfdb5c638a96ed643/7549504612.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0aeddea3---vajidakovuvobil.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca6f2862e---bamujudokupafatudupotebaj.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/69fc86fd7fcc005d85467c9f839fc8d5/64186776568.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/34632507256.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/43592758306.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f62ea7be---57449784432.pdfIn PDF document text
    • http://amandamaitland.com/images/file/dogazadojexufodapiki.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_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 18524 bytes
SHA-256: 4f0846979e30b514f99af88ade27a49cecfbfd27c99075d67d149db74026a2b3
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10452 bytes
SHA-256: 133ce4aaf5835a961a2ce60a895b2fdf0435c7affc1332547f24d96fe25aa30a
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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