Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d9bcf8ac34c5b9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 17:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f30a212287914cde21d4fd5be0a237e SHA-1: 9c1ded8be248a9d191a6612b335a0f89cddc8194 SHA-256: a2d9bcf8ac34c5b93b0b22339b6ee958068b36b220a914076f8ef512bf458e1d
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing or malware delivery lure. Although no scripts were explicitly extracted, the nature of the URLs and the detection results point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=download+from+itunes+free PDF link annotation
    • http://dierenwinkelindex.nl/images/uploads/fodazut.pdfIn PDF document text
    • https://rinducm1.com/contents/files/30960979005.pdfIn PDF document text
    • http://altus.pl/userfiles/file/temonemuwikapox.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab8e1576d966d851394a35993d5f465b/81616791203.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lazodadimamomakazagozakuw.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/49160566901.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/90728027152.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/35862744246.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/93525422575.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140b26fcde88---lebanavelefadugilit.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/6671889222.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xafuvumetasumavagizedewa.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b802285983---megavo.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/66975379507.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wixujaba.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/valebimokaroloxoramiw.pdfIn PDF document text
    • http://na3.it/misc/file/zevoleliw.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109181211362437.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/44459201491.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/wifezafiwobi.pdfIn PDF document text
    • https://medius.sk/userfiles/file/3047529570.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/35e041d6300311c1cc8f30c77aaacd51/gesilipiripugapitugixipap.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/wizumezop.pdfIn PDF document text
    • 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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 17560 bytes
SHA-256: 563366200db29db9799644fde2a831e8cc1a4b81f4e44eeef0e0cb0c1a30d5cb
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10700 bytes
SHA-256: 7334075cd6098641d933b83d40b3ffbcb7dddbe80a52aab68c4a915075db53be

Open this report in the interactive analyzer, or submit your own file for analysis.