Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfe68a7a36e6f93…

MALICIOUS

PDF

89.2 KB Created: 2021-08-01 13:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81c4d18aacb0ee6a89c6c2533f4c2801 SHA-1: bac5fd67af916758140b0478abf8c28df8601e5e SHA-256: 2bfe68a7a36e6f935ba104b88d98ba5e13e7cc3197bc9897878025a89b66fb5a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nomylo.ru/uplcv?utm_term=kiwi+fruit+facts+health+benefits PDF link annotation
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9ed02453fff884f6e7201f48f6c7228e/nukumasogudelumisafe.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o8ehfrkvnbj6j250qj1j61pdcs/govizivuru.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/61788f08ed5034e75c74e0717cf260f4/jajimipopor.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4ikdodecfqjj3b7b1lio29ed33/5405972133.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ni06c1p7aqi50r8jdd068t6loc/977341331.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/lefibalunurimarurine.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f004c43ae029853a67ab2f48e3caad91/37923592919.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/kofuronopuguzomefagazew.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/bolimogudolabuxolavoziden.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ee99fe16c96---kevapodareteluzo.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/banozuxezage.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/gejisudipap.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1d5c1eda---96126003541.pdfIn PDF document text
    • http://12shio5.com/contents//files/dabobovafakup.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6980ef4385eb45ea286502eb93f3b9d3/nupulobitexinebetoxoriwu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/folep.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/88075189052.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/25837261677.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cvu9mctm5fuc5k4qu1e2q8tu0j/nefajazeludeb.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6351e3555---nagem.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/4910188272.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdbdb2a0b3157f3c22f4c68a53e8a49e/puzubelumamusoloni.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/12003553655.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17fe1c64a---jukosenipeko.pdfIn PDF document text
    • 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_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 16616 bytes
SHA-256: b632733e4031f9a1b6279743200e780d7a8a7255ef0e8aaca15ef874ab6d6462
font_01_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 10628 bytes
SHA-256: 3aeb468fbe1696664404f7a56a33b5d1c8b8ddde13e09190ec3799eddae89b6a
font_02_sfnt_off00013dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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