Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ec597b1cf95180…

MALICIOUS

PDF

94.6 KB Created: 2021-09-01 22:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f785bfa6d07165d592f22c68bd2aeae SHA-1: 0217ca962f99a33ca4f376adb4b0565f1b86b904 SHA-256: 70ec597b1cf951807cb1b6b1b4aefaa055d1652050fc1a53b7455377a59e90d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/evfv7rknki3siqai750ok48pgk/38155807397.pdf In PDF document text
    • http://bagiez.com/userfiles/file/12379038308.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8svg61btkivpghsjufv28d37il/zatazigaworitumuzewir.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/13790943059.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/73582b718a2524dfff4c6fde2d75e8ed/53275668127.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/nimufojavadiwenixore.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/ditodafegedojogematidaded.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccb1a6995---34415861403.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/341n17d25i4ntelvadgmhd3mlm/mipolevigijupulufawulujis.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vajukanoxunubuvama.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e80ed00ebe---44656984472.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/73c9c9d29a641f1aaf2c1445522eb8c7/fofurufan.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/81261935024.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jobuje.pdfIn PDF document text
    • http://ingore.cn/upload/files/67996853534.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac8f62193.pdfIn PDF document text
    • http://clingac.com/d/files/48164588701.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7146d5834---naminiwazefelen.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/24913588754.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608358114ce28---6081352640.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/ruturukegomepawimel.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f7855c29---jaxozipe.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mexukebipuworusuroza.pdfIn PDF document text
    • http://exima.kr/userData/board/file/49933025823.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/sabavogoxolipadapup.pdfIn PDF document text
    • https://nasikampung.info/contents//files/totaxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sonic+forces+stage+4+red+ringsPDF 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_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 18928 bytes
SHA-256: 2edc6ce41e3107260304ad1d4c7234fdb441f8b770ab6afdaca2bd1c13b26775
font_01_sfnt_off00013a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001529c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529C 10760 bytes
SHA-256: 536f449f6a8f617c60f06d878031e36c6509029efa693cf44cf1d16e7b2a03ca