Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf261ef35def9fcb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 05:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 984e78afe1fef00d23a3e9e5869f63e3 SHA-1: 8c8b6cbe4de35990eb9a7e190314bd9abbf93937 SHA-256: bf261ef35def9fcb393239fd49eefef4243e92ba4bceb28b5b05b38e046a172d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware delivery mechanism. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9kuqplglj9ab199a3vium2pv9o/losinigomunufirabev.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dm89tr5r64dqlcog58ra0gijf7/nexutimeka.pdfIn PDF document text
    • http://jar-ted.pl/file/27465415196.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3f923924fe398c4714e80ae822992eef/85260007560.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/11879278405.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/62958586756.pdfIn PDF document text
    • https://andana.us/files/files/17342024542.pdfIn PDF document text
    • http://skisun.it/userfiles/files/60063918220.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/visuzawobol.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/86av507t1kufosjqc113de83lu/99808555893.pdfIn PDF document text
    • http://renovator.cz/files/file/tizimorulotivuzitaxusutex.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac422418bef---xuxakatonuwewazogugok.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/16701183442.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/jirewajolirojafewiripexov.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/fivaverasarug.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/18740043969.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9700804ff7---61947542912.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b344f8ef4b3---47083864051.pdfIn PDF document text
    • http://benetalent.com/upload/files/79929245806.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/fepubonif.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/38452597936.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/lazibuzuxux.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/38296602661.pdfIn PDF document text
    • https://motecx.com/images/file/81100849728.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b022b395c9---39515912266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tutorial+belajar+bahasa+arab+pdfPDF 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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 10824 bytes
SHA-256: bf8ac5df8ab6db64e5c3c417c80d051bfc5e9ab0a93e5a217c125d6abe32a77d
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 17572 bytes
SHA-256: 5bd4a429b245888d5cd1f52594e271b9f5d2088148016caba18f519ca84407fa
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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