Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ce507f46dd3a52…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 17:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a0064d7dfa5f64fb1b0637c659b8b0d SHA-1: 5346049a48a5dfa860a26e723ae35994692b911a SHA-256: 04ce507f46dd3a52d02b19ca0a174760448ae4680c172a39f4e22b7b751358fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2fce5a4a---junasixulu.pdf In PDF document text
    • http://wurbs-hanau.de/userfiles/file/terenosutozegitamolat.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/vulafisupurebomibori.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/62747265364.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xevubane.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0c7077262---12026969219.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qrqnncl9rs46skue4or9kcdna1/keguxose.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2f472c59c95b339ffa59b04b7986e0ce/11941254032.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fomolesopivegowavabawa.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/milezeb.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/74470983753.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/43442656272.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b878e6fa82fd637081cc1f8ba6ebf4bd/suzelakiwuzorosa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a859903d972---dagejewiki.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c8b090fe---80429289430.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/luvaniwijovex.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff9e2e496---83400800677.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/balafexolemesona.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ae2f31368966450371453109024cc222/kekoviramuxedavar.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/97019957045.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608addb08a044---ramizaturidixuzikonid.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/ralixanowopawid.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/48804743202.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/palozonu.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/89354577164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=daily+use+english+speaking+sentences+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_off0000b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 20188 bytes
SHA-256: c16e09ef54cd1dd96a216afbbade3225846f80db3edec1b4395b6876ecf11d00
font_02_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 10984 bytes
SHA-256: d91243db3a1fc3ed88e9bbe054ec7652431f560bbb290caa892c30203acc4daf
font_03_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 16212 bytes
SHA-256: 06f75ca824e33c594950714454ca4dc3bf670c28b947b5a2dd9f30d78c5f8ab5

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