Malicious PDF — malware analysis report

Static analysis result for SHA-256 53850941b7cd704a…

MALICIOUS

PDF

71.2 KB Created: 2021-06-27 00:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b1e2cd6df71386adfbefa4c372d67f18 SHA-1: 1be5fdba6fe38b9b5b61ff0ed22918846359a0e9 SHA-256: 53850941b7cd704aee5cfd81bec1755d3f547523c3b5ffbe74055efe66b5589e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely disguised as educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8207f944cc29662548b006e12ea84d10/niwaz.pdf In PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a534e80003eb33cb439e497de5a4b7cd/18829341461.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe54d25946---59552525534.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1ebfeb4d6e90bfced13d9c1a3403f30b/zijanatiwer.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/32872536974.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c1e5de1d---87296104082.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0095a225b---nafegibokiduzujuras.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/47499906332bba1e52805779b35482fb/72621691488.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/vosivuriwexitaketuxebalor.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/44684334317.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/37131364519.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/76676677678.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/decf228ab6a5ea403cc861ef4f0a7b1d/rotedofedaratadopuf.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f166be14d0b9dcadff6943cfa644b7c9/72483940735.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/vobevizogadir.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1224572c8---kuvodenavolomuloz.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8ec5a3d2ad6847d8ccbf14cd423cd904/69864686097.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/97494699095.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/limedizoxubamefov.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/2631947128.pdfIn PDF document text
    • http://pk.mo/userfiles/file/bijulebafanotaw.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/luluruzivu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc0c4f526---tutademukas.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609877506ccac---94308307554.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4dc6102f---15865399242.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/79a8fe52d58137a8cc949c40362c6e32/disijepukekofubir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=inequalities+in+triangles+worksheet+answersPDF 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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 10764 bytes
SHA-256: d5ce4a5d5314d05d02ca35ac6b12e34110c758848ecf5ae5166f095abbaa7b08
font_01_sfnt_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 14808 bytes
SHA-256: bd429d7072bacc28a892a2fe90af7fbeaf4d13fe28c852ce1f15fe6ccb298edd

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