Malicious PDF — malware analysis report

Static analysis result for SHA-256 08083d0f87ed3dcd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 04:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f12028d6c0bba3f4eaae5c4e14ab0ef6 SHA-1: 4c5fb6f4be0c466ece152e33eb65cbe44c49fb8e SHA-256: 08083d0f87ed3dcd12b65323c816e291da544687cd04ff98ec03938b95998563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous URLs, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f944441a5e---98876036184.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/06f48acaec4a1390cb1f61a20b70c93f/siwalugubutemabar.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/zavaliva.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff269d3684---kumorusekomekinemewari.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/71620795957.pdfIn PDF document text
    • http://lactopad.com/uploads/files/46927101898.pdfIn PDF document text
    • https://aokman-drive.com/d/files/65590058116.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/85128803067.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9dd0c382028aa62b86380f3f02d86d25/93520570329.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608677ab46ffd---1594827596.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1e3cf3a402279b01fe51111779ead715/34547330529.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/cf2f9c83c967abd2adcf8789cf58a0c0/wozuderejutilapureti.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c41d8d80cbd6498699fe014c371b0718/sewozifapazor.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/55946737558.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/wijipaxemejofeko.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/6246359570.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/us2bmo9becahlkhoehv2dgtatn/kabikejizorobiwejudefuji.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/mexilabeji.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/nakulo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/263bbc8b5e6005ee378ab4d8f0e61de7/88957701018.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ngja57oc6phq211c87nr04kjj7/musovomojorax.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/5125008844.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/14440762042.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/04b04d5d801c2eaa469a466a508502a7/malupegivixaka.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/36032371378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=academic+performance+indicator+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/67902632233.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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 10548 bytes
SHA-256: fe9be2e4bacbc882e216f00215bf1093588bc0573bfd9c7ad8f4b6b78f59779f
font_02_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 19744 bytes
SHA-256: e9654b6d9779927d6e87e1f7000ea2dcbdd0bdfc84779774cc9cc1e53de4ae88