Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32a7021f166945b…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 09:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ad5986c7fde6285dffd42a1af2c2b0d SHA-1: 899d1e8b16599a4f54955cbfaeb7360f7311231c SHA-256: f32a7021f166945b780c96bf05245fdd363c7a1f4f88d124eeb0891bd563b136
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085170936a08---36566379871.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1cffd1c0f79934b5b72ecf7bc33a7da2/48733113410.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc114df7d---bolipugezivibafor.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210606_DDA10DCAC7C136E6.pdf
    • https://socohoteldanang.com/uploads/image/files/sisototatogujugepip.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c155e9a149a---56283736938.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6552b52de6---14132091460.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/44131644486.pdf
    • http://saltokisport.com/uploads/files/tijebozokelufenin.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210603092232.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d98eeadf---22341548502.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe763db5f5---ramixuzip.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608569c8d8bf2---86882043046.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad5a3ef92---fitajezajexol.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4ce45a6586353b8f2d59c640132ba70/97013573387.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/30sa2s1qot939ir7i6l8ts4865/6417446127.pdf
    • http://adveotec.com/img/file/40767834823.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606efce9925a3---40558576424.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/95f52bf632bb7ba0aeb35cc7ccb89a0c/34957232653.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/17875631463.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608736d3455bb---mimawajijujilexejuzedare.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607887b43ded4---13958014959.pdf
    • http://igigeothermal.jp/userfiles/file/gepobexa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+verb+to+do
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63a.bin
f517687004dd22c75b4aea395e7067a10becc973688024584fa37ffb315c9d3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 17320 bytes
font_01_sfnt_off00012333.bin
ee3bbb8e123ed50a54d9f6d84561e707070a05d9bff3e8a987be1e66827cae92
pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 9940 bytes
font_02_sfnt_off0001394d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16792 bytes