Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a71380bdfb6e07…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 08:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b56135554ff9e8f347c38e1efd2c26e4 SHA-1: bf2de1477f7e5cf9875e73deed3ba8692f170e3a SHA-256: 09a71380bdfb6e07b22a715199049cd6175bde79ddae0606503fa3137209f651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and disposable hosting patterns detected. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=android+app+selector PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf174ea28c---jaluzadenarolefazupovaba.pdfIn PDF document text
    • http://synfarm.com/upload/files/gewojiluzelepetumiwige.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/pupirunen.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/grmm17k6m240qgul2gai11n2cg/lufimosalana.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/107388737661349217afabe.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/82849057255.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/17298696731.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/91648498340.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dng9f1rh663c9fllbgv5s5iidc/22482813711.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/16555301034.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a711a323abc91865c4b9babd8257296f/57008913038.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/11712250291.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/fogiwojilitasol.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/4196743163.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/96609053547.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/xemuferokijasaki.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/oj9egrindp25plkttmknfll9nu/kamipevelobajozukevoniz.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/e2d5f76d57ce8ab561fd2bc5b4c7746e.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/pigiwexabaj.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5342eb6a83199a50e7bafb06fefc8783/refigewe.pdfIn PDF document text
    • https://tomas-music.com/contents/files/10656942938.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/puxemok.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nawazavabepukeraze.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/82458783450.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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 10488 bytes
SHA-256: fbe9a636a6692bddd1955f552fa4833765f5a581c9882f826550383b0612880e
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 18056 bytes
SHA-256: f1ef23afee4d5338763e33ae603c5417330d6d6304d1babdd1655ef8b517635f

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