Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0d12b1f38d1958…

MALICIOUS

PDF

90.0 KB Created: 2021-07-19 00:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ac820e4221455274957fa355fc782bf7 SHA-1: 3f8b7160c2d4bdf6815777f1b0037eca4090d60b SHA-256: fe0d12b1f38d19581c43e772d2c52892a7c250bcbcdbdc0dda3b98c475adc9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further PDF files. This suggests a multi-stage attack designed to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://victoryelectricalsupply.com/ckfinder/userfiles/files/kixet.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65214ddb16---20473056133.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/491aa0a62f00e46154c48219682365f4/sixutalem.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/93391507090.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/8597145986.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/livimo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502203058731263.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95fab75096---22207689593.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/nurumexopi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3bfc194cca6f3ff9ad29c707a03be3ca/mijiwaxufuguxot.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/kineresereno.pdfIn PDF document text
    • https://taperagi.com/contents//files/gulilidigoxikegut.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zonamizitidupelukone.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/tipexibibijezodoju.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4a476ace---vitebesaw.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vevipusakilobebibiwemipoj.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/964292b70e97410c9e8048771f5269b3/worirofigizinakubojom.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/m7njsg28ue2rsg9vm3e9f91vrf/39990395469.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0b023de5352b2f775056b288e5ce758a/14295010714.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/befusozufovaxigixanewenox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246285a357---kexikotuwad.pdfIn PDF document text
    • https://dm288.com/slicice/file/75595388347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nahmias+production+and+operations+analysis+solution+manualPDF 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_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 10968 bytes
SHA-256: 12853a107fbef8a620ec9f9867579e82e45993e8572313f7aac64a3105efb3ab
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 18352 bytes
SHA-256: b4ba8eda9964cf7f0e27d44f6ed6198b9c1cea77b5fbf0657a6ae907004c2910

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