Malicious PDF — malware analysis report

Static analysis result for SHA-256 64dbc92f05dce1a2…

MALICIOUS

PDF

82.6 KB Created: 2021-08-11 05:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb2677abd497a02c626a007cf8089757 SHA-1: c43be23347f115b7860da15f5219e79c5322ea32 SHA-256: 64dbc92f05dce1a25b00ba2b5cdb34fa4fe649d38bca0b4a34fbe3a3222d1e1a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple external URIs and the overall structure suggest an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90d4c2487---38468965565.pdf In PDF document text
    • https://aymfly.com/aym_image/files/56404877225.pdfIn PDF document text
    • http://becucci.it/userfiles/files/namomigenezor.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10660a6261---viresos.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/17081091640.pdfIn PDF document text
    • https://digireg.si/upload/xawiwoziw.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086826c1e555---60203679488.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/18409972961.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f16681f4---fekalof.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e270abadd9---mirodujivibig.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210612091018871.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/8407676542.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc48446797---43172469155.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/rap5qssbq81dr22acnqdibokda/13507008731.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/90868972122.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/49541908723.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/89409456541.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c93e9d32---xarekozukemozif.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7978f37c2a---suteluwerajo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090735051885---loxunalakuso.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/9013155978.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac4e1aa5e3---6891356661.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tugorejejaxulap.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/wodasebojavixubajeligeguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=maquina+de+coser+singer+florencia+45+manualPDF 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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 11172 bytes
SHA-256: d001a30d2c2ce1760284977bc2d414e194a75929ad105050f53cc0f4a6b01d1a
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 17520 bytes
SHA-256: cdc2e1737bb095c0001b74629ae0bc3b11a31e020328f24e5ea74051fc7fc03c
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1