Malicious PDF — malware analysis report

Static analysis result for SHA-256 03575c5c5052d476…

MALICIOUS

PDF

91.9 KB Created: 2021-07-27 16:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47d57823a4f5fb152bc3329d46857efa SHA-1: 9b947482578f77de00482ce28a91549997363d97 SHA-256: 03575c5c5052d47634721227eafb016a5b7b65c4cf37e603a82e94e60226022c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dineflon.com//files/tirodakopijodonub.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd614f836---66153102230.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/bipikoden.pdfIn PDF document text
    • http://spc1962reunion.com/clients/c/c5/c535eb5d361035e84cedf1152ec4da8f/File/fozizo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4791684dc4---13873524095.pdfIn PDF document text
    • http://talleresjpg.es/img/file/dukafavokobiwonekasegop.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/77911981357.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/26469766367.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/ragemivozawopusufe.pdfIn PDF document text
    • https://aashianarealty.com/file/vusipetosekirida.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/wejuwovowap.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/semifojolez.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/wejagisezijofewotijabulix.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879714b1744---sawixutirafivujep.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7d3f506c8---vidofipegudilorazutawe.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/wuzoketalotelotupe.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2891b80c4d---rulizifadusaxunebiv.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c9cbb47f5---kumeritefanotu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lg5fhn8rk658srgt5ek2ks8uk2/damurugobibavijisatoso.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3543ccb379---zidabovadoxose.pdfIn PDF document text
    • https://xigmatek.com/upload/files/22428810231.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f9334109c43d2bdda7bc3fd8a41d5242/wozupo.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/nagikujuna.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/33209388270.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/mofapowil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sudoku+gratis+para+imprimir+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 18712 bytes
SHA-256: eb9be4d63cc6a5d259a66b0dc44dab06cd724c5f32441456a07404168b14c351
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 10828 bytes
SHA-256: 44a1e28678c4f1ffaf1ad44a8a03b1f718e7d48a6294e9742b4084816377ba45
font_03_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963
font_04_sfnt_off000148be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BE 16140 bytes
SHA-256: 61a689b2040f4a35dbc6fa766f7c43776a64fdb5ab975a49d30241655d41e80a

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