Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae539029821c1944…

MALICIOUS

PDF

89.1 KB Created: 2021-07-24 09:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b16503736ccf42c7f61329926875f7a1 SHA-1: 6879dc5d0d1c55c031a9136b22546e59271caf91 SHA-256: ae539029821c19445fe3c751844f4e1dc29484aa4682a64bbd5fd08a4da1257d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a13a962907---28389278460.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7891df6aa42f7a962b75f04d33efda10/vubus.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/rawogusafunekibapege.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xowolasofiduwukalizibax.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nedonajaxi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/88c5039231d21d83922728fed7263379/mananisadevumefomedowe.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff21468e78---31100847524.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210718094538.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0283af2e89---42594061410.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wixenesomazizixagigare.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a120bed2c---guxupenejinafegafepikibeg.pdfIn PDF document text
    • http://amandamaitland.com/images/file/81378332948.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/820fa4adc805115c89cdec2c0070ba65/dukujikekuwemazo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d982114d827d314fd0186505f43e9d7f/15995116522.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41410765a---doxutinivifuk.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/wofelu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afda3162dd4---xubufazawakufaxuzo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8f8bf745---gevaf.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1adc3abd---togerezigadule.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/45dtel0gf67cua8r9cofrgurb9/ledujupujolif.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3ec4b4fba65a456a319a4658422d99a8/26726566617.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bhu1aua3qnssjm866fj0kkiq7g/22586433180.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/71973820774.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/rasunodozorunodulamika.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zudobax.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/42449414152.pdfIn PDF document text
    • https://noddy.nu/images/file/75900202596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=candy+crush+soda+saga+cheats+for+pc+free+downloadPDF 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_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 17016 bytes
SHA-256: b4ede2a146c2d39297f938d9fb1d37fae4b209f09e32f749fb153266427ed629
font_01_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 11140 bytes
SHA-256: 613e71a051a659b452554e4ed15b130a0ac43e9a7eef5e7cf990054bcbbb6cbf
font_02_sfnt_off00013e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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