Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70b939bfdf38505…

MALICIOUS

PDF

105.9 KB Created: 2021-09-04 07:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eee5fbad8cb05cd75de6a2b4e7577bda SHA-1: db7d2d54212e686479e0cd44a92a2f0cd8ac094e SHA-256: a70b939bfdf38505845d84c40bf48c6eb8deefbf9a54840f1bb29a804c9f5e59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://aostavet.it/userfiles/files/golubenaxezivewuwanulir.pdf In PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/fufasofikowugokovogoguk.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160805e9d3adca---38029952063.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/konoxitigukotofu.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/23409184796.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb80c5c0---sirejugidal.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/55091744520.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/84405672537.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/71871132522.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/71318183732.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/85650622331.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/64124629306.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/vukerozaroz.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/41829153523.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b00c848c60cfa2e482f76a696aa6b83/97318939078.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/varuvivavivuvufudejetu.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160772089ec541---wazibolugedubagugin.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/3945658415.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/34067900706.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/34765799004.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/nefamofup.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/56652755124.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zopudiligafemeromudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=les+livres+sur+le+developpement+personnel+pdfPDF 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_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 22020 bytes
SHA-256: cd7e57559969c8cd8761a6b9acf16537df14e3ef33163e6d28ca2b1167bca9cf
font_01_sfnt_off0001681e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18035 10620 bytes
SHA-256: 53a0f4b165e784c85a96c3cbba6a048c339b47694a1a330d10e7d742efe7a10e

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