Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ab6eaaa789e6d4…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 05:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2147d2314b1ae2c6a3e93d67292ce41b SHA-1: f14c471d1d5fb0e980e5a249ee95fee45a74e2ac SHA-256: e4ab6eaaa789e6d4ea70d97ba190f3de9677e24c4325ae610c5ecfc8aa56a5c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=jack+and+the+beanstalk+spanish+pdf PDF link annotation
    • http://pjzhengwang.com/upload/file/20210723_054833_146.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6ef65c4a---xixadagimira.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/99325564707.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/juvakopuruvexen.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425df39047---73812365961.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16134238450600---74400390683.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/28353690503.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/rorase.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5a388eb1fe52a54f78997ddab76b436/miripexubexupekad.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/14760025486.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efcad5a7ba---valevidogijo.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/xudurebap.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bosedomarixu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c1917d6a22bdac432f7a8420c80b5810/65823049045.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3481ee31---64834127000.pdfIn PDF document text
    • https://ms01bet.net/contents//files/62845525751.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/15211049481.pdfIn PDF document text
    • http://frigosztufi.ro/ckfinder/userfiles/files/xoletive.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/soduke.pdfIn PDF document text
    • https://discoverthesky.it/file/dekize.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/sujosomafaro.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/48704249730.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/96217238005.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d944fb1d445---faxidori.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d531779d28d---kewiziginobok.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/9459423447.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_off0000c287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 18752 bytes
SHA-256: ddd413683027d47a3f71060e7db1ad725adbc180960038f8f9a2f71aefda481b
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 10720 bytes
SHA-256: 3ea4c868839555ac8b2e683141612ccfc997eefad9bcfe767fcb0dcdeeed9a18

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