Malicious PDF — malware analysis report

Static analysis result for SHA-256 a689f604643a85e0…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 04:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c4f7c26d30d98d3f060a002adfad21fa SHA-1: 4b7d51088d7565b92804e8a96ce4e34090dc29d0 SHA-256: a689f604643a85e046af82e456e496a71b529cd9887f9e71c47a8778208639d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of multiple external URIs and a link farm heuristic indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jizupenipuvobixedalamig.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/f1jog42sictbb52a9u3574v4ff/tobafeketuzidor.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/26320958208.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fb9da4e8---47337242905.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003e60e035---38804801886.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad1d0febf---72174157988.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/56212242396.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bt7j88t9ha3mh3kugbjv8u8ism/67561755220.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/tdlbhtkj4st2rurtuf1lvqie00/redazizatifotizasi.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/39150654040.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/26306394164.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735fa07e13---56894012743.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/44378312244.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da3260529---rotuwarosuwo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/baxuxabe.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/8u6596h39c0ujdu6qn0pnt7elc/pejujexuxewerir.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/39481808052.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/junujalofupuj.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0krknq26e8tv1qg0rsgvod0pkl/45281318444.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///87210008363.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/tagadejunol.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c14479e1a3d---36326340489.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d9f12bc1---fokolukevenudebibotasafe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jabewox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=covenant+hour+of+prayer+for+todayPDF 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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 16948 bytes
SHA-256: e079b4207ed0a8a01bbb7297630d4cc7b35cd0ad93359670ce013925bf160e36
font_02_sfnt_off0001336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 10600 bytes
SHA-256: 558a22f8fd9ec79f65ab93323afc332d8de19d80577cafa238517c64cf2b1e40