Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fcb60c1baa90b5…

MALICIOUS

PDF

65.1 KB Created: 2021-09-26 19:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7933f8474597242d1bc89a9f5e5ee3a8 SHA-1: fd129cdac0137dba6044b0c4cca291747a1a39c5 SHA-256: 94fcb60c1baa90b54f9f16a37ea8607b85fe3ca0c10275ac7c6583a8d5262a65
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8856

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://files.ibiza-ferien.de/file/kazulakijovesatiludizatu.pdf In PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/77718014031.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/komanew.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/88801502008.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391c1808f30---75414267473.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/38540657215.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/lowurivovuluganulonaxon.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/20468376118.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/82446680119.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/befisox.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/4265344264.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/wodojuduxajilumariromiri.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210911120816.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/3479442986.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/60257379405.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/bojavutawazu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8ed17ed0eafb3767a39168c26514b6a0/93149486426.pdfIn PDF document text
    • http://polipack.ru/content/file/lowibunigeb.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/lefuladenuxirewotusirare.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9fbc758de79fa44d5c1ff197447cb5ed/80945908193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=direction+app+for+androidPDF link annotation
    • 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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 10400 bytes
SHA-256: f6a4c2bde7e7251fa54cd2edc3f9dc0d6f4a54feb6287d3127f664c5f2d76274
font_01_sfnt_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 15492 bytes
SHA-256: 5fdda3bcd6d0ec674942acc29799fdbfd49f947c64586ffacef8421ade0ca6b8
font_02_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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