Malicious PDF — malware analysis report

Static analysis result for SHA-256 a331c5810e318b14…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 02:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a914f27f5dbaadff3e03cc407102c99 SHA-1: 275dff92284a50c4b4341612d3fba3bf50f941c3 SHA-256: a331c5810e318b14abbe45bc49646fe6ecd3b547f0643fe1ec1b9db3aa1e63e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malware. The presence of a 'download' button lure further supports this malicious intent. The document's structure and numerous external links indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/56348663210.pdf In PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/j5sja22e5qh4okkugtadschig0/bajakexek.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc5a6599b---54112723305.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/wevufufekisamozuzifakab.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/62111237360.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/5064585559.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/024f0f8f66e35ff2ee657cc2e4e44343/buzekaworozoxubag.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d0e50b12d9b255dc87683cbca19aae4d/25180518602.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-25/20210725161236989696.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f024a71d92---28451493852.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/zopevaraperam.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/2938437f86c2646b03ffbdac71b9c8a9/23035887480.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0csifi6rph6382tjrtrjd8i0h6/20485302976.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2016ee914---84096323769.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/73320645403.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/32150349391.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8320dd09c---41432317469.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc70beef2a---jumag.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606d0f55f34d9---limedofoperunijub.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/dasixeniwizazukorasezugi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e618b09c933d78960f3bd8109db8a053/39641839342.pdfIn PDF document text
    • https://agermag.ro/mm/file/15892435874.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/tital.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5e38585pcu8vllfocek7m8gnia/xoxavugado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vidmate+download+apk+old+versionPDF link annotation
    • http://irodori.kir.jp/files/file/joleru.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_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 17488 bytes
SHA-256: 0b41545f26accfc24ad9ec47166a3371f34eeaab5370fa26e61288a52d1d48cf
font_02_sfnt_off000139c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C8 10768 bytes
SHA-256: 1a588b930e88898178efc3404fc36fb6c72fd6786f177016ecc8e36531b1a631