Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8b1c70eef20235…

MALICIOUS

PDF

84.4 KB Created: 2021-07-22 10:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5464cd2ae8772e31e60904d3ede722c SHA-1: 4a5af6b45aef38296255003396215972061a89a6 SHA-256: 9b8b1c70eef20235feb8ec74ef703affa5c717ba10f094b1dce2166692401d50
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

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 http://sun-green.nl/ckfinder/userfiles/files/kujekowavixare.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e05152c4c630d94156c7312c69ffa567/78438451119.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf522604a6---notitenegabujubixofawom.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210708_22918.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sifug.pdfIn PDF document text
    • http://ministerium.pt/files/nakalanizedenefepil.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/88990990519.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3996428b9---nezazamonitif.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095d81aea5---wajofomiravegagix.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda918cc95---fotuzevakokeve.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ca0e97a---jugidugizabibevizipojuwa.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/76304991278.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/83787837644.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/afbabd9c353aa10b459b896ec5271e5d/52767793552.pdfIn PDF document text
    • https://wecareprogram.org/images/file/fesobavekodi.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/30461278280.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/jumujezugosu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fed847127---44726182515.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/xugetijofititunojigeroral.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bf275572dfb8ff697628a2d85b0a8499/50996511554.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c633921bbe4---zemekizizakuti.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d02071ea683683590fa4df19dc1539fc/murupujobulif.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb16496827---ruvigemufuz.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cou9pouq905ov9ku94qs0jkps2/37104273650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=apa+reference+videoPDF 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_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 10348 bytes
SHA-256: a6929f3f110ad9c0b8d34821c06d18cc65fb082f2a0e6749ac90815ac9f2e42b
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 16876 bytes
SHA-256: 9f380e42f9d9b1edbdcf322e84a597088de3c688331422868b515d6f090e4762
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1