Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f001819c721617…

MALICIOUS

PDF

92.0 KB Created: 2021-09-15 10:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5248fa5a847c29d7284cbfe90e62c6e SHA-1: 70598e9abb8c4673bb5f89e6ef1db4fd00550d70 SHA-256: 97f001819c721617ffd00d98af28da109625a91a39b1a3f8d3c8d4d10486e77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links to potentially malicious sites suggests an attempt to redirect users for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--aknmedical-yub.com/uploads/file/tegulegaxilabologudukezo.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/45602274132.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6a3949a9---putumazezojip.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/59113268451.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210904133802.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f3d56a77---81363948332.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/34373378236.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c9fc4b9216d0646151403d9ba936267f/67877757319.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/78409563814.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1cc50d64---51223488983.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/64877754006.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/14199b3a586c729917e9684d35308444/logov.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/55776360458.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/pijokigijubomakiga.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dokisobazelozobusudanumom.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/liwomukopivi.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/44869364615.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/sijokitisetatasozusoterap.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/8266908734.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/buvigitasul.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/86904646552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=unable+to+locate+sdk+flutterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 25120 bytes
SHA-256: 76eb7f0cacdf2caf85c7178beeb64671980a6ccff6da52ed81b02ccadb2a12f0
font_02_sfnt_off0001330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 16356 bytes
SHA-256: 17c9544f83ac311f75fc3e4d90c5ca0fa0771fb5908d6a30ba83cf5a0f1392f9
font_03_sfnt_off00014984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 10716 bytes
SHA-256: 081add0c9107cd9ade38d01ed4e31c471a2305447516a69d30f3bf7a6be80604

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