Malicious PDF — malware analysis report

Static analysis result for SHA-256 544ee55ab4fce778…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 04:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfbef775ad43927d8db61fede4d56eb3 SHA-1: ce76e19f7945fffd900f0eb1b301065fe1529375 SHA-256: 544ee55ab4fce778bfdd07480cb7b02f5e964ca719de9d40196150ddce959ceb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristics suggest it functions as a link farm, directing users to various compromised websites and potentially disguised PDF files. The presence of a 'Password-protected archive handoff' lure implies the document is designed to trick users into downloading further malicious content, possibly by providing fake password instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+to+password+protect+a+pdf+in+adobe+reader+11 PDF link annotation
    • http://parkety-patemal.sk/files/file/6845827401.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/jolipibenolavug.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/70998409776.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/bukimimuxi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/l85vtn17pi24r6ff3tr4krnago/70989949097.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/df4938c3b9f65fb87170a0258791fae4/zoletemarurisebak.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/rilezepixuxomikasuv.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbbb18a90a---rezofepifobuxizijonifare.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/50221099488.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/48907560059.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef3f85a74---75037128452.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/jazawakeladasi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6f5cdab638b61a4cc308be5269d4b65b/13698236527.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160956eafcd241---tarebebexoxivigoti.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739c15401dd---fezelutuworewosu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/51264839953.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/74712628774.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26562801752.pdfIn PDF document text
    • http://fxlcd.com/upload/file/selenexulujufanatamexivag.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d37386ac4d4---34449771595.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afb333bf328---zujaxoninofarifakopiwojej.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/19689937147.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/vagitiz.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zarogejodotowosej.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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 18380 bytes
SHA-256: dba84245438691a346f37624775d61bb129bd019a1cea69e11dbfbf8e16f22f0
font_01_sfnt_off0001187f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 10836 bytes
SHA-256: 48dcfd26a8d2fd95131b377ba37be5196e660bd5e749b78c9c0462fbb1fef52c

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