Malicious PDF — malware analysis report

Static analysis result for SHA-256 9386aec14cfd2af7…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 19:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b9365ae2375d726161afa9eef8fa51bf SHA-1: a3cc8d35a953e22d9ddcd3d1521d17716418b89a SHA-256: 9386aec14cfd2af7cf8c3b648f0de60f9d7391b0267bbe3bf4d7091b242e4e57
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially untrusted hosts. The primary goal appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1a099d94cd58aa214a507da17f0b985a/rawukuz.pdf In PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/lizaguxijukanilapaxerasat.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb874e573c9---2662801666.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/65400284981.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83927155827.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d093d144344---vijijigunakuxikoxojo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876874ab811---4352239902.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dipuxejabezofositi.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4f5cbd57---30884958492.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0a3e1538e1edb2fd976c024c054b47fa/nilabumezivo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608833030ccb9---pitavadifulogofivezuriwo.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2733ccd534e6060eb524618c910a0214/xezanibab.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dbe414c5e---58638403426.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a84e53a37cae02818204aef2e18d68bb/50555012819.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/56bfdfbf3370196914ebf928abe2d9a9/rewopevorasedegaj.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc930df5fd---bivozetogonevuduj.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b56eb14e4---11515970098.pdfIn PDF document text
    • https://codecs.ro/images/file/rezaxokigumijikalasin.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m0sgmgat7qel4v9oco9d6or277/texagid.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7da66ab4---dajolikevepapidogog.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/e0h70gf8034juvmr4c7rn2jn7v/rivofalegowizomenepikuf.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d1f8b08e---62649582767.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/naxidomulinimejilalegi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccdae2323---81850685317.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cee1209ec27---dijinunabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=unblocked+games+for+school+run+3PDF 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_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 11244 bytes
SHA-256: fdb118bb92d53f14a8b4004ac624d58336ecba26262e63919265be52134d06ab
font_01_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 16760 bytes
SHA-256: 33adf837ed10fa4aab36d225f617e09020c8f33a9cb7f647e9d6c600fc869272
font_02_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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