Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d719dda1b215983…

MALICIOUS

PDF

86.6 KB Created: 2021-07-30 21:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 234cd4c7fbc7c0ade9952aa1b83c1aa4 SHA-1: ec872e06deab11548c5d27ba7b8687e7bc67ac8d SHA-256: 5d719dda1b21598351769a8e5abb9b30a10b381eee7dbf25f0092f082fbf1270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8b26620ro08suuvq4ghggttva5/munudusafi.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789ca3bd---zororazen.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d507bf9a2b7---rutasawelerisubowo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v2kqd3sqn0tnsims5ukc8ltb77/voxiketo.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/jipakunakizewurixonofig.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/dowoleg.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/levowuwuzaxamirafafiwif.pdfIn PDF document text
    • http://aimic.com/userfiles/file/muvej.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79d18d0eb---wewivodilovadafa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8704970e20---24115027060.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a612fdf7---38463475839.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9faccd90d7babfcdc610214914e36cf9/50875248878.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/80096cc891e83333a95e8ca5df1d97ee/vuzozapezujamukumeba.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdeb6522f4---wofofevewurawan.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/86344486268.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/pegux.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/nijevixomekuxiwiwi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/032cd4cc66f018ddc55457e9cde1dd84/84308367059.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607290fb3f83d---jufowugidufadux.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/dolekekawiwukegizasamu.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/fuvufusibarepegawutedorad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=reinforced+concrete+design+by+oyenuga+pdf+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 17176 bytes
SHA-256: cd8cf9646a714f59e5e33544c870729f7b929a1374f30be1d94989483e2d2f85
font_01_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 11280 bytes
SHA-256: 0a121b212d919eac740d131ec8c37fa3d00c0a2a6756b64d15202d02bbe7f25c
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F41 3116 bytes
SHA-256: 74a4a355eed1f2d485a390f350a90aafdda52652403ad31bbe18e6b107043e60

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