Malicious PDF — malware analysis report

Static analysis result for SHA-256 b387cd2e133147ba…

MALICIOUS

PDF

129.5 KB Created: 2021-07-18 07:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: faf10ab7e21bbdbb4c04c76ced4679f6 SHA-1: 666deb66b1b851a13b98ddd85d948c2f3b73b34f SHA-256: b387cd2e133147badcf5cb4a07a7f146ca13042d070c953d75bc8c6b88c8188b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis reveal a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b4a9c728f32722214a38ccc611aeda74/sibiwufobemebiko.pdf In PDF document text
    • http://csptech.net/admin/userfiles/file/71091000325.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cb7d5696e---mekazara.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/dab1fe437ded39966cb0d7a7d757c574/dugujonojonilel.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0be21c98---nepebanevafadon.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/688729facd2352f7c79156b91452a006/92133735329.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/514b65fe9ec01639fd03da3418702fd3/40111093320.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/29524030219.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/75b808cf8f8b99c3eba3e7250d509aa1/61007294913.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/fifogoko.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cfe13f0636677ca39a175e59784d43ca/nemuxefatevojo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/nuvijadotedisomirix.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/24570951935.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/51903183666.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/e5fc1950f1c959f5ddd554eaecd63bd0/97780113450.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n8fkpomeeq76niukl3jlhl9tj2/bomib.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/kenipofuzagati.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb778c76c---bexijilesafiwirarefibev.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bk57b658r4rsiiaeob0n4mt01d/13175463936.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a874e8f047---lolaxaganusumuvesekakufem.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f105633---feziralasuzutawokuputetal.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b7415479c---damuzawew.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/76791250360.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/145d19be9c261fe4639cef2453b79365/fonapabaxov.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/01c2172cfb1cb20f2a2437cb59cb8a72/64391236498.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/60587937011.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/34492f6b45e08ce2e89f057f500b6732/tijovakiwiz.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/49962921326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=root+person+of+interestPDF 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_off00019abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ABD 10188 bytes
SHA-256: b6261bf0e569561ab6c5029d861bcccd3a409d065f34cdde862f858562705ae5
font_01_sfnt_off0001b1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9CD 17732 bytes
SHA-256: bda7ba5ffc21bd21d53d7a2efd9b6f70b89a2bd69217eaf8ee915660df04399c