Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d07613f75d7ef8…

MALICIOUS

PDF

80.5 KB Created: 2021-08-29 02:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: faa750e9c53771a1d046cfb584dd20ac SHA-1: 9f5c21cfc7be3e25708c8d6c7c3e8ad56fa7ed97 SHA-256: 87d07613f75d7ef8bf0a957e502bdb1c6dea1fccbc0338080c0080ca16c817dc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=fun+games+unblocked+for+school PDF link annotation
    • http://files.ibiza-ferien.de/file/fagibilud.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/60566709921.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/doxepufeb.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/13227386869.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63bd2468fc---vuloduxa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afca39bd817---jolisavasim.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/51364701890.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/gutofepememegewufisej.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160746fde5573a---ladiwejakonoraxirawo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n60ted5ba8khokhrdkd2qgh62m/46072540342.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/fifeginaneranu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607055296101f---ditevagibazo.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/jesajusadi.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/memafotuvomikebi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5d2b5273adc012c9e1d84c645f344d9a/60909690390.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/fomapevizafeso.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/86700349035.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/1185508017.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/72430714284.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/58484179384.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/punatikasonebabaxu.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bokakiwokilelutiw.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/554bfefffd47d4be3a531991131426a8/87701684362.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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11040 bytes
SHA-256: fa087ea2ffa1460fb4a8608097aa4438a4be46f3d231d87fb49f59d7dd05d472
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16580 bytes
SHA-256: 704e04be9d1083f08bed2d67443c400020338b18c6f5c9ca74bdd914f8239133

Open this report in the interactive analyzer, or submit your own file for analysis.