Malicious PDF — malware analysis report

Static analysis result for SHA-256 558aeb5ff5e5e29a…

MALICIOUS

PDF

87.8 KB Created: 2021-08-05 01:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dff1685507646c78a87f830b8a7fefa1 SHA-1: cb6131a9420968467c6102236093ea5b3f71e275 SHA-256: 558aeb5ff5e5e29a5163a22b43a7a3bb49c039a3fd5b49d3ff3ba6e1f951372b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nusamulticentralestari.com/Uploads/userfiles/files/rerur.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3gv0mj1hda4c7p2jjap4h3iu51/fupujunaxodeluguk.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d44e828e2b395373d187276f15d65471/22719471672.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5e4d1347---60228118059.pdfIn PDF document text
    • http://rc-modeller.se/images/file///87498662043.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/72443573978.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/8470951407.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0a853fee---loruwilinutokezikuripon.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/35212236689.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/44490854625.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/26006208127.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/moxinuxoselapesisa.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fc09d9bbecba9a74fa39f6e336d5a988/18953581330.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rurubajomegi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fiviwiworumideguni.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/24655202549.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/xigadapu.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/40679719355.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/guzasipar.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/zurapop.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/novazinanawogig.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/rt5o0bhq9c0f5llloo0f9blnc0/xibom.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cc9f60145---xeratuniloju.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cp1ul9gr6qodpo9uus0bf1ecpc/lavurujesoligigefatukeref.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5809743be73bf71506d246eaa131799e/6849918502.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/07avsbt8raeo8afes1unn22iie/91442360687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+a+girl+voice+changer+on+ps4PDF 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_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 10976 bytes
SHA-256: fd1314c490b6d879fa7fba22041f358f4e1e676d07b92cadff925822e509a0df
font_02_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 18056 bytes
SHA-256: 2e9a6711157984ae0c6b542b6847f69e61adf5cc516da618ffc38b00f0a5affd