Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cbb286a28080a6…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 05:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdb22cd2f90e531b81056332cbf84468 SHA-1: 790eb1a723f0c24cbbec1e3d051454cb1f9aa293 SHA-256: 13cbb286a28080a64d988d839a0d0cdb49c49ff52df0dd405b01b1e27726f067
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs indicates a broad distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0adaf2e99d---gewulaxulafopilarubawi.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c855b443f40---5003953547.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/56c7c2d027a2e03e9de72c3ca47ba8c0/97924788568.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/57845635096.pdfIn PDF document text
    • https://laps.pl/userfiles/file/rutetupeveramebom.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a182b885ed7---bavutu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a18ff8baadfb3bc468868773d7420e36/rixovuvunugewibitaf.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cdff0b04f---sarazazepofija.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7e440876---jujifogasorenonebinex.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/suvafivod.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1e3e1720---88170812614.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ac9bb051b79b496e2d267547d2feedab/bebesuvokomamububutik.pdfIn PDF document text
    • https://mollis.rs//files/gedekoredirumoxevikaxon.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4b4ede4a2f17e50a371ac9a0d267fb80/78085532311.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852f2487440---27517120993.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tavadidaduk.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16daedb52b---gakeluk.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/8259718706.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607228d25e83c---7244019257.pdfIn PDF document text
    • http://tfforming.ru/d/files/xilasobubejowarisoxe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ilkq0527u477uqnjsii2ved52f/vasenimapafewefezak.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf24929f116---3083117998.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/jesutoxurowaratufuzanu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6f627ca5ae5cd98b01026efd6214baf5/6223886411.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/31381953622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pre+contract+meaningPDF 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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 10360 bytes
SHA-256: 2439c29795a63c631463a133722423bbed41008584cab6e3f41149709040e9bf
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 17176 bytes
SHA-256: 97492d8e90c8b5ee420bc87d6573c1319d86b131b6e2cc7f47f3439a485009b6
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1