Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa0033cff185435…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 10:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a39cb451e2630f502bc86551aee22a9 SHA-1: 2acf37ad6be342a15c8c2fd4056553ba6951e548 SHA-256: 0aa0033cff185435f2245468fbf3f1456711ccc4b36d448b0bab7bac6dcc5d6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDF files hosted on compromised or disposable domains. This suggests an attempt to manipulate search engine rankings or distribute further malicious content, potentially leading to exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b736ca00a5cb301a9534639862b2a087/37288976708.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609993f92ebb8---92913910501.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kuxagodupiwewoliroviba.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/87484883962.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40797561766.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/35840456486.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/24134261484.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9e6c8e3f---japubanigagemudupatanav.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afadcc514b8---bejibevigi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/ximema.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/98307851359.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/33153747a8ab8713650a36d4a3cf532f/90851757061.pdfIn PDF document text
    • http://schokobrunnen.com/idata/32039022044.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/92510682639.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/vibizosor.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/naraxi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084a58f40b52---deduzar.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c1d5486f---3735148678.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
    • https://ienter.bg/files/25040799966.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/giwazogarifipaxinu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/razatazizujumijol.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd6d7cbd8---57075877723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=york+chiller+parts+pdfPDF 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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 18328 bytes
SHA-256: 781801d752bf9982bc79f1a7728a931a4fc073cad4d29b8a1ba8fefa5413f459
font_01_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 10688 bytes
SHA-256: 5fd6999c3ec041fef18b49bbf1ca42f747f087727739fd0b9e95196005666feb
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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