Malicious PDF — malware analysis report

Static analysis result for SHA-256 f253ce5399f05023…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 08:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8d6fef15e5e27f4c6938970b3b559f3 SHA-1: b8e1f9ce466bb73096e9c20c8c977aa548fa6fb2 SHA-256: f253ce5399f050232d5853907790367903842de25af6f39a88cf9b506e1c93b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://wilocom.ro/ckfinder/userfiles/files/mumafejalogi.pdf In PDF document text
    • https://fotofidelity.cz/userfiles/file/lezikawitoleno.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3b81fa15---mivatojotagejavigib.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130594a79b98---vegupemamifibiputoki.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/23339055745.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ip8uapco4afjtb83ik3ngjfd50/debofojax.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j3hv5sujfp050kt7r7fd6tkq3k/jogufi.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/tevuzow.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/lagadekid.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xufol.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/48651725144.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/oegfs1mr4v662h31v7pn1u0k7f/44104266550.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/49997494833.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/20288601960.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/23975160223.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadf869327---rinapusikebabixorozugonaw.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/60718599966.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/kuriromabedevitix.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rumadigevigosumeta.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/52447809630.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/pinini.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/30553790589.pdfIn PDF document text
    • http://rurisnet.org/images/file/51509036618.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/bugufu.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/86840428027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=car+safety+check+mod+apkPDF 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_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 17396 bytes
SHA-256: cde4f7f2bae18f7b1ca9f1cbbd0be2c4ec4ec367897bf8834cd2d4bbb138a163
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 10880 bytes
SHA-256: 4a867ecd3e4467a407b5cd3ad5611d10299bb45114b48505d277ab4159042d31

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