Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab39976ca3deb5b4…

MALICIOUS

PDF

122.9 KB Created: 2021-06-28 05:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd4daa4bd3163f624dec1e0f4dca4f3f SHA-1: 30a317b7bf450a2b0451d4fe20906be219049733 SHA-256: ab39976ca3deb5b4f7dfa21d225efd0cd2f137b2707563dda259b274a2c74bed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=thermal+conductivity+meaning PDF link annotation
    • http://reicar.dk/userfiles/file/funebojewuxowi.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/xafikatifulu.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/waxopidezezasojupexusu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/jamuvurelubexoxenonevekop.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e68081f868df6ba1b7522b5163f374a9/gifutekasejexifupojam.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/066b7494a0a2000afd0951ee64bea045/jebasik.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745cee991e6---mawewelepewarusorota.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59ccea178cab33b92752d9734400ba81/minurikewigut.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6820ae8d9074b4e9117f66f35a393177/duduberirofevanokoz.pdfIn PDF document text
    • http://www.toptehnik.si/images/xamibugefumazulubomezapa.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a6e36998449e10473a274ed03bf78183/21773752217.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/8448596499.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/94857731949.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b006684a3154b6a7063abb77c41f71c6/zajimolar.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077494311e78---pofogaki.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/bf695444e0ca9db53b6dc75a0ecacfe9/70456147817.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/51092462715.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3f3c3ac8d9601e6f0be7e42273a70a3a/83294673540.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/rubowu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/41442b6a96d767ca6f96ae10574733ec/86186516111.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a792fbf9b83947797203dd8e655860fe/62900317064.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/lomotapuralufazejejakizis.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071000d5eefc---koxudo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1b3e1236---mujujani.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_off000172b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ACE 10892 bytes
SHA-256: 10cb3438caabca7d38387034f55c0ba8b4775e5a5d18be37085e59a6a6d73a9c
font_02_sfnt_off0001a395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A395 21884 bytes
SHA-256: c93baad0f5885baf800062a57722aa27498f373c69d352f04d67d76461f47b7e

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