Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fa4988359f77e6…

MALICIOUS

PDF

90.3 KB Created: 2021-07-20 20:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c3a15e7003e3ac1215527dd847d0495d SHA-1: 6cd3f2509545cad59c56cdc9c9e84c29b38a62c1 SHA-256: f1fa4988359f77e6565faf6f45a44730a574adef06852f5637e03eed6139b357
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/906c8e2cba4568311bcd4ef118ea5209/pujasode.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087358668056---11568403168.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091804b82425---14545072416.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3dedfd42093a66c0e0e41904910afd56/buwogo.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/dalexobi.pdfIn PDF document text
    • https://vestol.bg/files/file/15168016620.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/mesamisorewamemegisaxa.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f8fb4d2f---vusigakemuvemivabiv.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/87837052542.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/48364566791.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/14/file/20210714_004119_189.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/98077248688.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/sesejijarevawududekad.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d5bdcc64---wituzakakepewowame.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbe817f7dd---waxowegufotagaga.pdfIn PDF document text
    • http://ciskmv.com/css/file/23885534424.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/46666464436.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879fed9dd84---jomupuz.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/80940402962.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160838f6d7dda1---titefur.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607238a3531cf---mupowunurusoxikawetaz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b3a697672d031375871fdd7eaf5ecf16/xozusefejutimek.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0j01mhco83l7vjrvkli03tm692/jitizaweri.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/dokelitujenogujimadi.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/butikilirexakarepulikul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tongue+swollen+after+tonsillectomyPDF 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_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 10940 bytes
SHA-256: b919864b870870fc6d85a2d426ed48a125d675964c46ecc10649b7cd51cffb89
font_02_sfnt_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 17044 bytes
SHA-256: a59fa281ba8fbf034ba05f17e8b2535811f8854abdfdd09f65fd3150420f25c5

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