Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ee555da77ab0e9…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 23:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95ce046df120cfec9befb74d773a325f SHA-1: ea3b77f3a50cba3e1cd50074d423bbb6b2bb22bc SHA-256: 71ee555da77ab0e9294f44ad0cdc3f2e0e4faa5c44483e34b153de766450d579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://oniceh.ru/uplcv?utm_term=world%27s+youngest+self+made+millionaire PDF link annotation
    • http://bienbao.net/uploads/files/16318751423.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0ea9ba6d---nitowobizizozopam.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0912543b07d63b5a4b6861679deb6cb2/97339050797.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/82125577002.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1cca5863ef5766721c7f0c6bef7464cf/gevopiru.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051009474249.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/guxosexodedudufaji.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaa600fe9---73607031340.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/jizirovif.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l9u0jc67jnaak52k8pnj6fncn2/83827838204.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/26ebc1c2bc57e941b66c1d3f36ec0ae8/nekewe.pdfIn PDF document text
    • http://kbchina.de/upload/napuvafobiguz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d7b5c066e---sonatudiparonafome.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/94934538972.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5197b9ff---bediwapekokomadudaxirubip.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375f284798---bewidunumotupefu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/49334071721.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba370e449---67416879457.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/57157695599.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ho1od37bufg2cre5c0vr852o4l/takakuparobugebe.pdfIn PDF document text
    • https://assistenza-termica.it/file/31401571888.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608feff3a4c78---33697138014.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/jebubemeguvobevowewise.pdfIn PDF document text
    • http://hak-al.com/resimler/files/6259969488.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/rezofopemixiraxuba.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d9913820---sedepaligatatudulunu.pdfIn PDF document text
    • 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_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 19048 bytes
SHA-256: 7f319ff8f36a7fb1131616e09f293371f3d9748bd9a74b8ca1cf8f1b5c173863
font_01_sfnt_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 10936 bytes
SHA-256: e95a00e3db15e2d7b15373828336332a0d12263ea9ebdb5e0c684540653b405e
font_02_sfnt_off00014167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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