Malicious PDF — malware analysis report

Static analysis result for SHA-256 d987cb3ff8844a65…

MALICIOUS

PDF

88.2 KB Created: 2021-07-23 00:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57559e2b876bc4871ee5c2b45cae9b4a SHA-1: 3e683c2f9cc2631613dbb2e70393092d5bb768b7 SHA-256: d987cb3ff8844a65a04e1bf48d48fc4b35b30d5ebcaf9ad1bec4740d252a7e85
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other hosting, likely to distribute further malicious content or phish users. The document body is heavily obfuscated and contains no readable text, indicating its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7fe6dd4d---tuxobavesad.pdf In PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/kaxasupo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e12a5142159d26c168669ba58bce03f4/zopipirof.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/39836060485.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/iltisk8iu1a7cq855uo8rdequd/47896597609.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3774c1e73---54017394164.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/1671522972.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210625_205117.pdfIn PDF document text
    • http://vhktn.at/images/content/files/56135932309.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3370e899bbe5f42fb5a39e0655cc69a7/60526954450.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c21c230f3---21405972861.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c57a06d95d82973b5d1b95be68e8cf7b/poravupulenodun.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca15a7c3de---38980763279.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf81f6fdbf---25620071975.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fcb2e398a---62225482518.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f843213beb1fffb831a72c4f227a0251/69136530004.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9853c271c---49824968332.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1586514b---metajewafakipalilixur.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/98396410880.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ca5713fd---jinulonosu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f11e8164---kisepazixibojofilisuj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6865aba88e---bifopotolibanevudamasifa.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/65331146860db3e3b24a7a.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3c068d70---17105525579.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/37328228120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=index+and+middle+finger+numbPDF 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_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 10604 bytes
SHA-256: d9eac971d1a4289eb7f74f939d85f61df104cfd4577887438a3f983a75e5f5a8
font_01_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 16644 bytes
SHA-256: 0327f8790be5875cb06c27f9951ae56e3b82993cc4c1ca9951bef560d5818626

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