Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b70ea05fb55f17…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 13:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c02ca5c68aa94cd3f841aae7c608fa35 SHA-1: adc0f4473d140fade3ad0a7541a01eda6662e98e SHA-256: 41b70ea05fb55f17fb8a88c3fe5765f29253192c3a0d84fd9e12ef87fb207a23
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains multiple links that redirect to various domains, with one specifically impersonating Facebook and directing users to a credential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting. While no scripts were explicitly extracted, the presence of numerous external links and the phishing lure suggest an attempt to exploit user trust via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://archism.ru/uplcv?utm_term=photoshop+para+android+apk+full+espa%C3%B1ol.
  • 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://archism.ru/uplcv?utm_term=photoshop+para+android+apk+full+espa%C3%B1ol PDF link annotation
    • http://englandmatchshirts.com/assets/file/65369257061.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/vutukekelusukivekibu.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/11836117194.pdfIn PDF document text
    • https://andhimazhai.com/images/files/zarafo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5e91e9057ce4617a77227f72f56f22bc/90199783053.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/61204978839.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mepogafiveguva.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/kibejakogobamatumirozufu.pdfIn PDF document text
    • https://birudongker.com/contents/files/74811017542.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16140907f128e4---maserogevisiwufuzufada.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/36802353021.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/85165213520.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/pedeserigatubu.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/6542437536.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/76698024003.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/75617117382.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/dopuwefufuf.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/71327350090.pdfIn PDF document text
    • http://grupophi.es/uploads/files/30060355435.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4854acdd---78526352394.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/58709713656.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/68908416289.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zakovukuvirazulog.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/90863186169.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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 10992 bytes
SHA-256: e7ce049e752163647ca13f9645f22132269df7a6c19395daab08fdbe17406719
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 17968 bytes
SHA-256: a39f3da35e54d28eedfc0fcc5abb214f7e4f2f9724a3481e6be576042d657cca

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