Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff3fc515e43909d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 21:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 23b7480a937e10e6881761604c60352f SHA-1: e99f9d2465480873316633c15c65b9764ff891bd SHA-256: aff3fc515e43909de13b564f96255a11c1ee5458cbdce34dabae6ef241bfe506
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URL farm and the detection results point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=olympus+stylus+epic+mju+ii+manual PDF link annotation
    • http://bsa-billiard.by/images_from_html_editor/file/17936000959.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/19359890348.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/49442339410.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/47fa894f3bbd6206b78d817a50256e69/jukevafisuwukuzofazug.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78844249475.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/voremedugokugatibup.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/nisiborevamig.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d94975e2---83977447350.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pbriptnp26lrgthupgd0lg9gn4/67212272166.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d619e1901e---42942574913.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/sutepizujuwuzu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6ko2mjgj94fm5he13i93r6uf5i/zowov.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38541703bf---nefipafule.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/verakapedarekarizixojig.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/kowexizimezanexuloxogurid.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/fotiz.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/84374474844.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7f934a9a---70213707990.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9116fff50d3f562004a0be1e141b3f71/50996057982.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015ce0ecab---lomap.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rk3ercn2olaghrk5g1pf6b8da0/26883424667.pdfIn PDF document text
    • https://sambelteri.com/contents//files/mudarufamizavoxagulowo.pdfIn PDF document text
    • http://getvisa.ru/images/File/87124626895.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vag6vnsk9b6tvr3s4g8il76ht4/kalok.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/56625482310.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/27316742924.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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 18236 bytes
SHA-256: 4330dbc6567e8f8de499f7007671d1110c2cc96ae8ec295974558e372bcb6224
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 10684 bytes
SHA-256: 8e899cd8f14f3c6a591aa36efa4386980d9fde06dc6e1b04eb3b0c0f3a7c87c3

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