Malicious PDF — malware analysis report

Static analysis result for SHA-256 1318f8ae210f7f97…

MALICIOUS

PDF

94.0 KB Created: 2021-09-12 11:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01a8953c9f6e4f0b9bc1380e210de783 SHA-1: f227e6c646bc8963984e605da524c241c69a2f2d SHA-256: 1318f8ae210f7f97cc979e697464f45e52801c298f5be5e2b1e778ecee54c1fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://laborke.ru/uplcv?utm_term=best+android+apps+for+notes+and+tasks PDF link annotation
    • http://bsa-billiard.by/images_from_html_editor/file/surolaragegexisa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f4f53cf4---pukopava.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/19202630526.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/fudatuzifikod.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/femakakaf.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/gujolagujes.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6136e73c4b7b2.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/lirawuwuj.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d352ae59---tijawiraboxet.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/kabusowifivakepeda.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zosowavewase.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/53285508447.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/memolivibox.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/mafuzotinirinonod.pdfIn PDF document text
    • https://digireg.ru/upload/86742901887.pdfIn PDF document text
    • https://techlan.pl/files/file/18540115996.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/36532270205.pdfIn PDF document text
    • http://clickvay.com/upload/files/4007083228.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/judavudorolaxosikaku.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/49156448901.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/63644137280.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d22c362d---jigomasidonegag.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04f28ca87---37537776164.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 17968 bytes
SHA-256: a9278c8ff404875aae7004e34a4edacd60933ef52c843b6a6382330c84ccb4fd
font_02_sfnt_off000138a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B8 10588 bytes
SHA-256: 47d5c66f95c7b9c665086244cd6a80fe51f044392e253a6aaa4693b6772fba54

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