Malicious PDF — malware analysis report

Static analysis result for SHA-256 94467bb164a98e1c…

MALICIOUS

PDF

85.7 KB Created: 2021-08-25 22:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76b9a0959f43bed15425dd58ab7c1312 SHA-1: 3721eab45f634a6b0114d182b51966c2ac9f99ab SHA-256: 94467bb164a98e1c34983c372b7ec9966d3efe16acc7f1df1614d6b11f1f429c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=party+in+my+dorm+mod+apk
    • http://bielwod.com/userfiles/file/27097774436.pdf
    • http://pc75.net/upfiles/file/1625579285.pdf
    • https://monyetmesum.com/contents//files/61128209823.pdf
    • http://mynigaoe.com/upload/file/20210730054401.pdf
    • https://asiajitutop.com/contents//files/xifasofapo.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160707aee193f3---papoji.pdf
    • http://luxe-pools.fr/i/File/91926743319.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461037d326---34305243371.pdf
    • https://marbeyoyun.com/calisma2/files/uploads/40855869091.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8193f7434400eb50625e565d837882f8/zolunokazeje.pdf
    • http://akcjonariusz.com/UserFiles/file/faxitajip.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c18deb4166e309224e9b5b0edd31a66e/19176216759.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ac68350dd---lijelagotaj.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fjkeakfsv5ln9v1vd2v8pu5ap6/41469376980.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107468371058---nolisob.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743bb3ba5f1---73261427201.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhp1vo7a2enouruggrb773omc7/bavovuleredo.pdf
    • http://trans-serwis.com/userfiles/file/solalijule.pdf
    • http://fszhenjia.com/upfolder/e/files/20210710115832.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/lobumi.pdf
    • http://al-bandak.com/userfiles/file/88070850609.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105708d8054---55338225932.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d25882730ffbaf71724a02af1c14deb3/kiseragamelidimixepor.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac30671f---bewusa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d817.bin
52e4bf7fa2fd1307808c51e2ab9c39e481296755482ae4177c3ccfa8c77f9907
pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 16696 bytes
font_01_sfnt_off000103b4.bin
c9186d153240890c2785deb777a01dbacd5a77f37ae65602b798b9a77b96bfe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10416 bytes
font_02_sfnt_off00011b3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 16792 bytes
font_03_sfnt_off00013350.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16140 bytes