Malicious PDF — malware analysis report

Static analysis result for SHA-256 931119e820a223f3…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 04:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 956d3e189e4a3ea2bad938eb950da84f SHA-1: 44dc4754d61a4517c3a8c7a6c8ac7690c34cdac4 SHA-256: 931119e820a223f3b51b0b0060998b545ff848a6c4f7cc5513879a137cf2329d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=13+14+and+15+times+tables
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/4f2a22494b2e6d63742697ae28fc9a25/10414893929.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a8514bd7b48c73a7b9e41f0a2165bfa7/futefomukamevesuzanatoweb.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5f1c39e7dc6266bbd30d77612aca0dfe/pifebodotiz.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b955f36d423---52409884055.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d37c2b9829---83291210834.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f58f0ab5f---54328485960.pdf
    • http://abogarestudio.com/userfiles/file/59987450999.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160722de4c343a---9428258469.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/26253515576.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zukafisegazoz.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hu3pj6qhg0iif1aick4jj8l2pp/kovomifiwa.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/kedepedu.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/36808733934.pdf
    • https://jagamimpi.org/contents//files/sefagafurepoxuwirarewiz.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8d18265ba101ddd9a4a1f6e116c45802/fatujewazuvugaxipikogokon.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f8bb0decc7ac5e06a787e82769e8d6b6/dinixajesonunixurodiku.pdf
    • http://blankheich.de/images/uploads/file/bexepavesuzo.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/35057125722.pdf
    • https://pachetedeturism.ro/images/files/robagopowojobapi.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6890be32a2---fatalexejomotamivorewu.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9pq6781eq0fjtjrof29buvbio3/15256827777.pdf
    • https://ctners.com/ckfinder/userfiles/files/10879447497.pdf
    • http://cheers-gifts.com/userfiles/xejagilefugimikuberuk.pdf
    • 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_off0000f117.bin
7334ebfae556796fddd376a3e42561ab6eed6336372c9dba9184dead149eee09
pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 17056 bytes
font_01_sfnt_off00011d10.bin
fd7a5d3987b6b0e84509847eec4b569b6a9278b1f742b353382c50c2ecbf70dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 10668 bytes
font_02_sfnt_off00013590.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13590 16792 bytes