Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b957777b06d1b3…

MALICIOUS

PDF

100.6 KB Created: 2021-07-24 23:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2995d7792512967696ff3a8f60952952 SHA-1: 1293099c4489138cf1cc9bf5e7ef00bf50994b84 SHA-256: b6b957777b06d1b3c21d68e3c975b928c4ad0a0a7e767b442ba0adc3230a672a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely to facilitate phishing or malware downloads. The presence of a security bypass instruction further supports its malicious nature, suggesting it aims to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a9898a1---78440660612.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/55314247005.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3117a21275---pexeregotaj.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0dc704bae72ec3f69157ef488877c2e1/bisovisagi.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/81542301323.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/16u8h8bi9ctbkepv5nclajcdli/natijamonodo.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/47250743001.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/7306110244.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e600823724---52168073904.pdfIn PDF document text
    • http://scpt.it/userfiles/files/temufenijizodebodix.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b6bf696fc7be82beb466dcdd54abd02f/88402227036.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/629c17faec6c0570969b9ebda5ffe27c/zewadogolezop.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/559850cd1c05aa5d1be45bb881fbba88/14881147221.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/posivaxufiguromovapima.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160add065e89d0---pokodawabazidojuwonewux.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aeab5d92---568868958.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fde28ce13---34566197141.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pqlgg350ptdbije2jejh0a4lkq/35697851274.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/fawekuvudozojut.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wiforexat.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0eb925f69---20935810476.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/naxadekululor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+xforce+keygen+for+autocad+2019PDF 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
stream_004_off00010d71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D71 21312 bytes
SHA-256: b6fa094148c81484c5ac712ad266cf5721018b225181f629179630bc97007ad6
font_00_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 21884 bytes
SHA-256: 6249a25be21ee8c0e3306d77c548b9ede73f970e417899f9f8fcdaf4c88f8245
font_03_sfnt_off00016924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16924 11348 bytes
SHA-256: d5ad632392227b477ae57b51d231f65acbcfe11bf79c7df5c4ab7141e9b53b5f

Open this report in the interactive analyzer, or submit your own file for analysis.