Malicious PDF — malware analysis report

Static analysis result for SHA-256 6792628bd5da5707…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 03:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d6ecb5dd43c3cf3fc12356c74ae2ef4 SHA-1: 82199616c73b9231fccaa723f669ddcd0d7855a7 SHA-256: 6792628bd5da5707c73fda2f2ed41d3398fcc7723411634aa204305860b794b4
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised domains and link farm characteristics points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://4reality.cz/userfiles/files/wepikibopox.pdf In PDF document text
    • http://debsecond.net/UserFiles/File/18448794988.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/tepowenefalemibo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16075b76f63dab---minudenor.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zajipesozajevidod.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bcd00dade14dc6ec82a5846da177af4f/buwogewomiso.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/kaxofojanerutepu.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zavasefokaju.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/26aud9ekce9hij7crepnd8mlj0/53881820578.pdfIn PDF document text
    • http://airfa.it/userfiles/file/38347085147.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/negafukujikomoperi.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/67855266111.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/314dbd874b263f7f14abfc364426e09a/jazajoz.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/nozubo.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/5987880889.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/79209442507.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa3a6af90b---97884724248.pdfIn PDF document text
    • http://brukbet.com/user_images/file/86512471059.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f1925c51---polakapedalurasegul.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f09326f8c37799cca93f2c4dab78d40a/bugusafuguxe.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/detusevorejogokim.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c1aa911e6c4aa00b472a633b08139ea2/milipeku.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85abbed9ae---27538468599.pdfIn PDF document text
    • http://vladekoservis.ru/files/valatevakerigi.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/19511705627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=digraph+th+worksheets+freePDF 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_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 10668 bytes
SHA-256: a886b7c0e101656b70874f7c5afecd9b67ac9f6ea24b3846f7b4ae9a49f922ae
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 18212 bytes
SHA-256: a900036d09c98b3f3bb105dc3c47736faf673b748066dbc536e2d1a0b5c292db

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