Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02816977027c1bb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 13:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f8b5eeb156e713dae915adce9ab5a4c SHA-1: 437428b0cd88a8cd05022689cac7f84c0825fd74 SHA-256: b02816977027c1bb1b63859f236fbc6da151bf83d93932f536fc2f7e83309bec
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these link farms suggests an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bea37e4120d996081a53cf680cbdab97/66985811830.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/javakixiw.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ccc56b67d9dc5c4168356060428f3e06/sojarebimubulokojuvib.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c324cab2---jafovovijefimukuzunaxu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/rememidomemezab.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/2451207177.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076068a279d8---nojokawu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/fadilotelubuzeguwoturize.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0611e68ffeee060c2d370027feba6f10/38154187563.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zerivazavabesarekuk.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd459510d5---20809939113.pdfIn PDF document text
    • https://t2sc.me/userfiles/84403475509.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8f4085724---nixaxipowaxadan.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/babamewa.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vscb8pfuumluh7a7ur24597c92/vewipivag.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/lavesejulezukiluvugit.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/45399781391.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///valosaruxilisofuj.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4d6858fd47a9ddf823fc04853edc5b49/vewadederapekebuwis.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b3e8c62d---95116196174.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec96d8bb84---13727091224.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gaxifimezo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///25726672010.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/55132082524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manualidades+faciles+y+utiles+para+ni%C3%B1osPDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 17984 bytes
SHA-256: 9a7366cbebaeff0c1ce8d691308da86b6abc0b96ee0f52af2f51d2613da36d01
font_02_sfnt_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 11024 bytes
SHA-256: 80fab9a03ba6a8ba734e0e6d396a86c08c141d3a9cc71cbf8cc2a6ff7e134316

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