Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b7e54d3b007d57…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 18:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a8e15c6966544ad0a546538882f57b9 SHA-1: 21e4f8271b0af1ecc19bebb6c0a84e4c5b9117da SHA-256: 10b7e54d3b007d572224af729352cfa535f7212e52127f26cc488eab7203e7fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=send+text+from+ipad+to+android+phone PDF link annotation
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/56365857766.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16149caa09402f---vegijovaxizaxulaf.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/82587346656.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/ruliv.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/28486874568.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fegrmmbqq1snl3if6ivu77na33/77626323581.pdfIn PDF document text
    • http://pi-consulting.ch/download/53824722890.pdfIn PDF document text
    • http://24cvety.ru/upload/files/7061489785.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5f33vhfp1rnc8orl8k4m24fcse/36898800061.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134614cb2573---4325649051.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556352aa39f---kimurimo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6006e8bf---55076563019.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/jivakidisedimixofur.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148f2a31aea3---79851099862.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/28117909778.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/43409023213.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144b8dc446ba---63922553456.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05303e15a---filinopifezevu.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/jimorumigululugi.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/32543276499.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c06665536---nomelesozejezirikunaril.pdfIn PDF document text
    • https://bawauang.com/contents/files/27878371492.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/89832930036.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/58682883939.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/60430581416.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_off0000b332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB332 16196 bytes
SHA-256: 1fd7b2692981d08ae1120d55f1d7e9054a8a9de945b914dc301da8f35eeae347
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 10728 bytes
SHA-256: c9b04b7ca1a3743475e6d7a859b41b2db20130f89ab2357ac0b47e0615301baa
font_02_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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