Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bb00f934287030…

MALICIOUS

PDF

100.6 KB Created: 2021-09-02 01:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 09e854e8ba27909b7f56d1ece70af636 SHA-1: 8024edffcb644199e7b44fcad3ae172380f409aa SHA-256: b7bb00f9342870306de38bb45ea2d060785cd07bc3f1c13fa7e0d23d5029f163
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or further stages of an attack. The presence of these links and the overall structure indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ed7a0f336edcf040d426bbc767ac3476/15165548377.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/kfc7vuvc9lgrdvf0thh19pc612/lixoxivetogawo.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/loxagobidoladaxiwivovod.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad6965f50b---rudewixupodevatujug.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1629180139935779022.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/18a060c2c9f6d245e3fcf0ecf11aa604/4176221285.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4d34cb5e397f2246bc69527da2aeb8c7/benojowegade.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/75855415089.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/61939733247.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c8ec97c405f62e03ce9b54c98d9311f7/zeviforeze.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/12168719764.pdfIn PDF document text
    • https://digireg.se/upload/lavelalofakofewodi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4ecbe4c27240bd00264339e8d6e42604/womododefujawubiso.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/95723202531.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/32889480518.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/kepibofefokorevaw.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/riwak.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/sosifolevefisubuxu.pdfIn PDF document text
    • http://axwelindia.com/uploads/24879078501.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea80d4c3d---53115293916.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7cbba1eb3946e768cff63c96037d0960/kimelevipugig.pdfIn PDF document text
    • http://mp-journal.com/media/file/rakumametubukase.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rulesofumekoxugid.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ca791e332d7add60326a0565a4188460/nodekorixokapafiwumafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=jim+caviezel+passion+of+the+christPDF 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_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 19412 bytes
SHA-256: 0b499be8f3d638a535742ebf9d3a544caffe9190337e7047ab8c14094ed82679
font_01_sfnt_off0001530f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B26 10860 bytes
SHA-256: 90a394ec49b81938572eb88ad6071f63a3c69d84fb755477ccdd078b41c4551e