Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c6aa92d16ad53a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 11:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 959d758282bb49e54d08689d5e5cccad SHA-1: 45b46b1e9f8fe43ef9ef74cfc3817f76d3104f5d SHA-256: 04c6aa92d16ad53a65efb7cc9b225332d82a3b6e4122d5311c82339baf01c754
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by directing users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=magento+2+developer+documentation+pdf PDF link annotation
    • https://jajugroup.com/ckfinder/userfiles/files/pulimepirififaxamize.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/95f75502399ed44c347f46bdbfee4a82/gusoxufoxusatodakod.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1f8cc186709b1228669b50a2c6b849ae/32526424029.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/cjr8q28b3054fib39o98fnql6f/kubolukazigedirokigaledi.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b75a2f0316290e89aa48edd431ebf5ee/24647013869.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/16037602641.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tetelujasexuz.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/26983564334.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/pugazeleka.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/30559614276.pdfPDF link annotation
    • http://fzcce.com/aimgs/uload/files/1888200048.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a463944af32---pilalulowifexaxudanuxe.pdfIn PDF document text
    • https://ckmandarin.com/uploads/gilimapejetotoximobi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60c013e6d---furodajija.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/96737470329.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/45326171225.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/pokuw.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/250dcfccbb5e5e963fc61f1bede35469/roredozef.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/26d6e9978c43a2f445bede19fc9440ee/gamutu.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/33275286929.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b8f749b840b90a48abc6007559aa12a8/9655685481.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/vibatux.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/58618549636.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_off0000d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 17320 bytes
SHA-256: e240e0f33cd060adb27302e94722c67690c99044e9d08b40fe96a455ace5e5f8
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 11076 bytes
SHA-256: b30220f0cf37edc6c829d697a96bbd7786f3ca35363f648b851c6b0fff4aa8dd