Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafb3e18d7d93aec…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 06:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb95c7b174f38c981dcab40728c3e307 SHA-1: cca6639f7f81cbe74a4b00fe8f969d17bd7b431a SHA-256: bafb3e18d7d93aeca2e9f6847a3096f452a97586ea900202c3921d0b30a43b6f
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'utm_term=file+ppsspp+download' parameter in one URL suggests a potential lure for software downloads or related phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://markone-tools.com/upload/files/86015673750.pdf In PDF document text
    • https://777mto.info/contents/files/gajawigapiwuxawiz.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/68445423025.pdfIn PDF document text
    • http://stevis.cz/files/file/58154899667.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/soratuxuta.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/naforufudufoduxelumimevol.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/nuwovuwerelifuvofeve.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/levinakulozivad.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/maworikunuf.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/tabuvexazopal.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/livebomenowofuxe.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210904_AE114A9711A1B396.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/94643302027.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/vemotukopelorine.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/4273910979.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/59697599704.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hst2rt763me7n1ajd13rdnt062/52664233446.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/71269236095.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2f61b20a30d9118a75cfc1ace66ed2aa/wakixononulojisut.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5d7066d7---1032452506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=file+ppsspp+downloadPDF 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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 17788 bytes
SHA-256: eaff80cd47fd086db17acd8f1fd879e7d3f263ae756b3e6f6b492cc01387eb3c
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 10248 bytes
SHA-256: 5bf28f0fd01b54a681806f981856ff84f032223e8975114936f3b5ac35325fd6