Malicious PDF — malware analysis report

Static analysis result for SHA-256 845a8744a035630f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 10:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb8bfdfe5b46638ade6ee4e3daadec5a SHA-1: d05435ec6268abdfcd212fc5781f16d0bd282811 SHA-256: 845a8744a035630f4a443da65557e5e27fd0e8aa0028ef0e887fb78a5bacc63b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links pointing to potentially compromised WordPress sites and other domains, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and link farm heuristics strongly indicates an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5qra4gik8801du3igt79ofpa7h/94210707919.pdf In PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jidovamoliv.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/zopokikebuzo.pdfIn PDF document text
    • https://iohrp.org/f_files/files/pemivetixevidejejujego.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/opn89bnrq97fl4a1k4qka6n98e/83559677505.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e8b93032ddd25868701e51cc313f25f4/4186745969.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755bc5289---55708275133.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b480e69ee6a---47616420063.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c225913a40---josunamujozuboja.pdfIn PDF document text
    • https://msvadba.ru/files/file/guzuperevop.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gro0empnmdrfm4dbv1sbdck3lc/54674800617.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079292ab304d---52512640058.pdfIn PDF document text
    • http://elm3rad.com/file/bigujule.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/9da7ad739b02245c81320e4a4d5082d2.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607851363bec0---zazapuviwaxigebudanok.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0132f194f9d6c809deb38791f37a7872/zurip.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7ffe9811---48006857370.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/81413170948.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/34751646418.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/842b43cb0ea9bf77191fc38c3412e2c1/45330804560.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/lezusimeba.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/79684091637.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/525836994.pdfIn PDF document text
    • http://stonebreaker.at/badijeri.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/99686556464.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/bureravijodakinugifukadab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=shape+worksheet+for+first+gradersPDF 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_off0000d2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 10880 bytes
SHA-256: 1e0c710d0ede9026a9382df6eed94bdaab04563c20bd55fd7db280f90ac8031c
font_02_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 17008 bytes
SHA-256: 5979aeaafde1881c4f5d969a3c648f6187eb672df6eac3e014ef8e2364a60c92

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