Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1827b169752fae5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 21:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ce129c3e2f1d9f3defa87cea9e83b41 SHA-1: 93ac0fce9f4298cc6e5d524acddbba16fde8ed38 SHA-256: f1827b169752fae55bfb166ec13456fade7c015e763a414509e21aefdd613210
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to compromised WordPress upload directories, likely serving as a lure for users to download a password-protected archive. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading a secondary payload, possibly disguised as an important document or update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/063698c0008d6d71c8a338eb5f101062/benatukirazidebi.pdf In PDF document text
    • https://led7.ru/file/fegogezilawada.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbf21234c---250484002.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6f426e3d724acfd9eadf5937bfd8a162/24293929783.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/jojoxameketeludewimowemaf.pdfIn PDF document text
    • https://norservis.info/files/files/60797594897.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133582f719ce---27830922700.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bebe0809---54240364833.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/vavolel.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pujivuvegalaf.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/vexapefewejowegat.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/33193144900.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e5c81e8b844b1b20854f0f01e7d8d4de/sukoxovenujimoteg.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nofoxomukakeguput.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/30788352747.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/torodamujejetefefibexe.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2f29fdd3866b4c52dfe8499d52281c70/5824591373.pdfIn PDF document text
    • http://sinners-party.de/media/file/44357760021.pdfIn PDF document text
    • http://plncse.hu/php_data/file/67543070204.pdfIn PDF document text
    • https://qnzar.com/files/96451389884.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/sakikaxukawuxigerosamuk.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/73009717835.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/46473362243.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/73562203650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=uq+staff+email+androidPDF 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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 10668 bytes
SHA-256: 47fb33ccea093736658cf00665e0977c29ae6bd0577f74fbb51cec83235b621b
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 17568 bytes
SHA-256: dcc54534e8ccbf7e64ee924a0533fd9eba28af31807c51bcd277ae6b48998111

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