Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edf447bd6fde274…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 00:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60fe17bec96592248326c8bc4ec8f157 SHA-1: c9ad724ae7fcb87e567ac75038db681ba4fac071 SHA-256: 8edf447bd6fde2748dbbc36f52496d98f4b01037c963c076cb0d9e36208c0bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a61d94b396950c7d4883c05eb11f358e/pelebixovorekorap.pdf In PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210606_FF16106C313D12B8.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d18de44204---wegep.pdfIn PDF document text
    • http://jucal.es/images/file/rozat.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/39682100683.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ulotdeopnbfq2jm4ea71fak6f3/lumevilasunukodunofomiko.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/duperipe.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f7040cd001c984163db20b1159ce941c/18749544417.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/99821177416.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081345cf2658---52018991184.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e8183d3176938b4709271b89c7b155a3/42496407883.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/dokukepeweneginajidesini.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dde0aab46---33707140376.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/zukiwuxaveru.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c381f368c---dimigexo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gomofibixesuxelozum.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ujakrlsc5stm539tc0s812nean/zudexadiwibamixiwujotepi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/28724295496.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764124eb136---3146640931.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/rozerebelabom.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/duwejifedefit.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/kexudaworotase.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c8d8a87a---69514932998.pdfIn PDF document text
    • https://tavio.ru/files/file/86591590535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wifi+warden+classic+wps+connectPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011dcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11DCF 23264 bytes
SHA-256: 3d1adb4b956a8d9dd8bf6993682bea0a5bd49ba1c32dd03d76949e7e24531fd2
font_00_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 18936 bytes
SHA-256: 4f4057f61870254a4ee32c34b6353cbb8e0ad68dd71845482e0d710d15936079
font_02_sfnt_off00014742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F59 10692 bytes
SHA-256: 63b829a0563ed584070ed716c1f1cf123c8c0b345077809370e37c8780a95abe

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