Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ab946ca6ddda08…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 15:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b134980726e5dfd296c9504448bc80fe SHA-1: 3c928fad10cab4583c128bbd6776b13274cd153b SHA-256: f8ab946ca6ddda08b420a31b292ebd4edcc1516dc1973931933193431caaa120
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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 http://saopauloairporttransfers.com/ckfinder/userfiles/files/tedubezopirekugewejorufid.pdf In PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pawewukumuf.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161338d804e535---53415615820.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/h6jod6kc0viq8tc0h8bthafne1/25139362690.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/83463624523.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/zomidi.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/63525297033.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0fb639c1---mewoxajupabikevoxuzisomot.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/jozipagajus.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/53317228694.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/numavapipetugibugotez.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/422865e94cf004eb3602ace3cc371ad5/91189391152.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/soxotagigoxewinakiw.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c37e782d1e19d4279b84173819b2446a/baxibisulu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f50241b91---88419116597.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/zavuluzubisurup.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/tixazasagajuputuwedebaju.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadb2810ac---xokuzizusab.pdfIn PDF document text
    • http://planetamama.ru/files/file/loviguw.pdfIn PDF document text
    • https://camelcarpet.org/d/files/20513397384.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/47729931632.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090516244373499.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6a5f27b87575a12a3d957a4f993255cc/poxeritugozupirir.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nufuvegotofikawokagag.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/demudexarapakim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=modificador+de+voz+para+androidPDF 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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 18520 bytes
SHA-256: e2ac4c0972a4c9138ae279195821738a69045d39619438f377de521c05854bb4
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 10420 bytes
SHA-256: fbcc691649822ef71b7ad1319e45e6a0f517e6b123385b2f0348be7ade4d9bb9