Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3588e7b996df92…

MALICIOUS

PDF

81.9 KB Created: 2021-07-17 02:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2948ebb07c6288a04a2bc39805108581 SHA-1: 5df8ac18b40c9a855cbfd736de056c836f5976f7 SHA-256: dd3588e7b996df92baf43c5dae80fe38fdb9c88da34bf8e5bce8c52f0519f2dc
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/160726e9c4d822---37779193502.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9140b7f75be41496c8f5b2a0201c4c3e/widapegagofipozinarip.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/20200deb38118443f1fb6dd2dba359fa/munumajuvulibinepalidafen.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5201c42bc---vifitigomoviw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781bdd2f0d---pazawaxuwifu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ogqknll502hbfhpd2njpo1scnu/94074459762.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/32332901796.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/13939591727.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/44324abb93582de74698e5073a3b5294/89805283587.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7d93c487---2582292760.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/47492119230.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6568b4a1d0675bb919f3e03bf77dfbfe/demusog.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/norugul.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/51885039111.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607219a92fe27---nanoziputufuduvupogefot.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ed67cdq2t0tav8gne2jg5pn1lm/kuteranosib.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/67129334161.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/61303591019.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jra82po87nq9i62vifjo7h9f3b/pezunavu.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/73565708684.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/040402e8b43ae4d8204e14b1dacf260f/rakogabubixisinu.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/80685187726.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aa34fe091cd---falumamuw.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/42u1rru71huiis9aibhl1rcdua/xajusedirufowidofi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430233204175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reaction+of+lead+nitrate+with+potassium+iodide+equationPDF 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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 20944 bytes
SHA-256: 4a2804fe443d0f7577eb9add0fe1c0ec4a313644b5c087fc5d697eea523fbc1f
font_02_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 11260 bytes
SHA-256: fbced0f8aa5ca7f58fb59593597118d8a96c05034642775daf9e7fe57dbc7f16