Malicious PDF — malware analysis report

Static analysis result for SHA-256 615005f2d826edd9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 12:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9024f6f09d0b092841108845f4dce6d SHA-1: 1e3e6c5e1a2b111dac26f2660309e9464ad99e6a SHA-256: 615005f2d826edd977bf6609f02f5f4567e9aaddce5300c6b28a3bf1bcfd0b50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a high-confidence ML classifier and ClamAV detection further supports its malicious nature. The primary attack pattern involves directing users to download further malicious PDF files, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=root+samsung+galaxy+note+2 PDF link annotation
    • http://kleinschaden-expert.de/userfiles/file/jevekovumilaneb.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94face464---80815236058.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc775052a---vafadaxes.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/89255573738.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/20982099782.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8e51c78427fff02f3173bb6b51c48a0c/kitadupot.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/kevife.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/zixunapole.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109050633357430.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/duvuxobupunun.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d23b6d998---samusiwuxokibonixidiw.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/nobisexazi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fofuwapuzusazoretegu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/sixitetotupama.pdfIn PDF document text
    • https://ifunb.com/shopadmin/upload/files/26761824847.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161334a39ed67c---63202077080.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93613484048.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/73410340152.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/939968086.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/lavunusefapuw.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/mogufapogubopom.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/juwogagu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b7fada16ce4b6b0c0043d03627ef9bc6/datakowigudovojud.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_off0000b3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 15592 bytes
SHA-256: 04a744dc9132299f89204a48eb8a7ffe26c4a80c30bcc2c7149f3c5f698e4f71
font_01_sfnt_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 10740 bytes
SHA-256: ed190fb2ca0361baed3ec965c8b9eb421b7f3d74d07014aacef67c29a87302f0

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