Malicious PDF — malware analysis report

Static analysis result for SHA-256 405aaeb137a8d804…

MALICIOUS

PDF

101.3 KB Created: 2021-08-05 22:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77290691a78d2efa519281bd34ee3702 SHA-1: fdc4cf926e640d7d178dace971c89a0b1f6c8333 SHA-256: 405aaeb137a8d8040f4b92e0445fff973f3a026bd02febf4b04a5d43a7225e55
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised websites, with ClamAV identifying it as a phishing trojan. The embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the overall pattern indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=expresiones+que+jerarquizan+la+informaci%C3%B3n+ejemplos PDF link annotation
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/f6p4hk7qtojuhrfrvk8jb0ark0/gojabelogemapaz.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161097727e67d7---4376646111.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/kogewifexizopid.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/kugoxulejilakito.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160746c3d6c363---rezipoxali.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/luvebavivasimuk.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/13544724532.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ea9b55f74791ecb54a79cb80a4451ce8/zagota.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/40400403788.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdd14b6a62---93481209560.pdfIn PDF document text
    • http://www.toptehnik.si/images/46634605803.pdfIn PDF document text
    • http://yuha.be/_files/file/xiputarotezemeses.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/5698887864.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/77792009162.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab76292b9e---44248152558.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ochb6b7b9hslv27bi6c53l12em/kezubilarasoxavataxu.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/76745298737.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/degujujomivejudelug.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e778d96e---kusipemisuzodezajunane.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3ijnb31ih88rtbjqv7d95goolc/tegimejisemeduxabof.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ffe46530---90395347724.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/fefutejumu.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/66907447119.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_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 20572 bytes
SHA-256: 167861043e14fd1c24d9937240d0be1c0d8bc7fbc4522c501a7f26506cf7eab5
font_01_sfnt_off00015178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001698f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698F 11200 bytes
SHA-256: e70a739a5a1e4cf6dac5f71c1b6742b8e756a2d6dabdb13566d8cf0fcbbf30e6