Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0fe4b5e1b13fe1…

MALICIOUS

PDF

120.6 KB Created: 2021-06-28 04:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2b24a2b2dd43283d4325164bc4031b9d SHA-1: 9e7d019663ba8df222284dda59c6850bddc97743 SHA-256: 6b0fe4b5e1b13fe106a9fdcdcfda5cb963ac2a4539bfc0a682c670786d6d00cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised WordPress sites. While no scripts were extracted, the presence of numerous links to potentially malicious PDFs suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h7t0ffr3ue7l30kf9n37isqf86/20552134402.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb2a12acf---wexuziso.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/5214506377.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rmim8gdvnn65q371h7r1rhqq8r/63049922113.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/wugoserogolukunamoralaso.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33624fc87---dowiroruxetizadeg.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/fubosaj.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6b5a81b8---49653174108.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cba7290b6ed---bukopoxul.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/xozeriganebejanofufu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080497884cdb---74636211103.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b53f159e0---kofopunobijoxe.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/12922182801.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ffae0d0fb93bc69ac72941de9cd8362/52204472585.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/1650034371.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7af6b0088---2839910169.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3628e95dd---kololexowa.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e35dfd1a---97211724322.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb9c6cec47---memorurowogozef.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210615040047_1158368471.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/p4amotm9autdf057dps0om8c4j/zonore.pdfIn PDF document text
    • http://chinahongji.com/d/files/77069349511.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef4248599---bifurudofapozatabis.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141c9aa809---bepunamanovavigugebured.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=one+to+hundred+one+to+hundredPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E52 16904 bytes
SHA-256: 8e7adab2ca277e7430996eb551d2d419eb4947003b203105a80f6ab858489a45
font_02_sfnt_off0001767b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767B 2416 bytes
SHA-256: 9d61e5af46905d5e1378c9412b21111c2a234b69030c5fae75a7aa99db3428d2
font_03_sfnt_off000180b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180B4 10000 bytes
SHA-256: b4e61de553c8d05b0ac3d480f91dda745fec00026217d22852cf57f9d0f84f94
font_04_sfnt_off000196cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196CD 23916 bytes
SHA-256: d39ee2ab9300195bab0c9cc98bbb639cffd32bdce5ddb1c75cca7c777fcbfa81