Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27d96181f697068…

MALICIOUS

PDF

77.1 KB Created: 2021-08-27 06:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a03ddcc734ce64d4b29e44dd30e6ad6 SHA-1: e06b5fb6803263e51758897e7f62d5bbc8321891 SHA-256: e27d96181f697068ccd1ac54dad3713b3a27a6c9bf752d002d303cb2b9a96634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae50b91ed8---22979161922.pdf In PDF document text
    • http://healthywithhart.com/res/file/9584229671.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9bu6nloirgga58q3633s8jnuic/65931920841.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/dejowole.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b67cca36267---felig.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zawekodotodugepogefa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608324b209442---23662666438.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5lanlvc0c450suoi5qqsaraa4/33378747165.pdfIn PDF document text
    • https://rjpexport.com/files/83872292706.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/74899779010.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/xexap.pdfIn PDF document text
    • http://zerosquareonline.com/file/pakowoxaredubufapelagese.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b199a2b938---54017658315.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882813c2adc---89408638734.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vezasu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/80700411848.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/44198996204.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2ef0752b---84471535186.pdfIn PDF document text
    • https://termocasasrl.com/file/xisorabi.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/jexubavogewuliwexiposama.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607471af977ec---51622868538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=is+1893+2002+part+1PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 15732 bytes
SHA-256: bdce54ca2e1d3ce04ca169d89a80b678bca88e53f893d7a1f31c48225863ffc3
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 10544 bytes
SHA-256: 5f83cae8244b3ff144024a9b6232c36ad1272eb6fc4c240ab143d1347248f3ba

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